mirror of
https://codeberg.org/Codeberg/pages-server.git
synced 2024-11-23 06:18:59 +00:00
555 lines
20 KiB
Go
555 lines
20 KiB
Go
package server
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import (
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"bytes"
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"fmt"
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"io"
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"mime"
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"path"
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"strconv"
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"strings"
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"time"
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"github.com/OrlovEvgeny/go-mcache"
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"github.com/rs/zerolog/log"
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"github.com/valyala/fasthttp"
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"github.com/valyala/fastjson"
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"codeberg.org/codeberg/pages/html"
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"codeberg.org/codeberg/pages/server/utils"
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)
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// Handler handles a single HTTP request to the web server.
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func Handler(mainDomainSuffix, rawDomain []byte, giteaRoot, rawInfoPage, giteaApiToken string, blacklistedPaths, allowedCorsDomains [][]byte) func(ctx *fasthttp.RequestCtx) {
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return func(ctx *fasthttp.RequestCtx) {
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log := log.With().Str("Handler", string(ctx.Request.Header.RequestURI())).Logger()
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ctx.Response.Header.Set("Server", "Codeberg Pages")
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// Force new default from specification (since November 2020) - see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy#strict-origin-when-cross-origin
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ctx.Response.Header.Set("Referrer-Policy", "strict-origin-when-cross-origin")
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// Enable browser caching for up to 10 minutes
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ctx.Response.Header.Set("Cache-Control", "public, max-age=600")
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trimmedHost := utils.TrimHostPort(ctx.Request.Host())
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// Add HSTS for RawDomain and MainDomainSuffix
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if hsts := GetHSTSHeader(trimmedHost, mainDomainSuffix, rawDomain); hsts != "" {
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ctx.Response.Header.Set("Strict-Transport-Security", hsts)
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}
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// Block all methods not required for static pages
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if !ctx.IsGet() && !ctx.IsHead() && !ctx.IsOptions() {
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ctx.Response.Header.Set("Allow", "GET, HEAD, OPTIONS")
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ctx.Error("Method not allowed", fasthttp.StatusMethodNotAllowed)
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return
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}
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// Block blacklisted paths (like ACME challenges)
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for _, blacklistedPath := range blacklistedPaths {
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if bytes.HasPrefix(ctx.Path(), blacklistedPath) {
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returnErrorPage(ctx, fasthttp.StatusForbidden)
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return
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}
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}
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// Allow CORS for specified domains
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if ctx.IsOptions() {
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allowCors := false
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for _, allowedCorsDomain := range allowedCorsDomains {
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if bytes.Equal(trimmedHost, allowedCorsDomain) {
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allowCors = true
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break
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}
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}
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if allowCors {
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ctx.Response.Header.Set("Access-Control-Allow-Origin", "*")
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ctx.Response.Header.Set("Access-Control-Allow-Methods", "GET, HEAD")
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}
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ctx.Response.Header.Set("Allow", "GET, HEAD, OPTIONS")
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ctx.Response.Header.SetStatusCode(fasthttp.StatusNoContent)
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return
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}
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// Prepare request information to Gitea
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var targetOwner, targetRepo, targetBranch, targetPath string
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var targetOptions = &upstreamOptions{
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ForbiddenMimeTypes: map[string]struct{}{},
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TryIndexPages: true,
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}
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// tryBranch checks if a branch exists and populates the target variables. If canonicalLink is non-empty, it will
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// also disallow search indexing and add a Link header to the canonical URL.
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var tryBranch = func(repo string, branch string, path []string, canonicalLink string) bool {
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if repo == "" {
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return false
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}
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// Check if the branch exists, otherwise treat it as a file path
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branchTimestampResult := getBranchTimestamp(targetOwner, repo, branch, giteaRoot, giteaApiToken)
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if branchTimestampResult == nil {
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// branch doesn't exist
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return false
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}
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// Branch exists, use it
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targetRepo = repo
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targetPath = strings.Trim(strings.Join(path, "/"), "/")
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targetBranch = branchTimestampResult.branch
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targetOptions.BranchTimestamp = branchTimestampResult.timestamp
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if canonicalLink != "" {
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// Hide from search machines & add canonical link
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ctx.Response.Header.Set("X-Robots-Tag", "noarchive, noindex")
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ctx.Response.Header.Set("Link",
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strings.NewReplacer("%b", targetBranch, "%p", targetPath).Replace(canonicalLink)+
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"; rel=\"canonical\"",
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)
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}
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return true
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}
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// tryUpstream forwards the target request to the Gitea API, and shows an error page on failure.
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var tryUpstream = func() {
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// check if a canonical domain exists on a request on MainDomain
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if bytes.HasSuffix(trimmedHost, mainDomainSuffix) {
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canonicalDomain, _ := checkCanonicalDomain(targetOwner, targetRepo, targetBranch, "", string(mainDomainSuffix), giteaRoot, giteaApiToken)
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if !strings.HasSuffix(strings.SplitN(canonicalDomain, "/", 2)[0], string(mainDomainSuffix)) {
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canonicalPath := string(ctx.RequestURI())
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if targetRepo != "pages" {
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canonicalPath = "/" + strings.SplitN(canonicalPath, "/", 3)[2]
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}
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ctx.Redirect("https://"+canonicalDomain+canonicalPath, fasthttp.StatusTemporaryRedirect)
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return
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}
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}
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// Try to request the file from the Gitea API
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if !upstream(ctx, targetOwner, targetRepo, targetBranch, targetPath, giteaRoot, giteaApiToken, targetOptions) {
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returnErrorPage(ctx, ctx.Response.StatusCode())
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}
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}
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log.Debug().Msg("preparations")
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if rawDomain != nil && bytes.Equal(trimmedHost, rawDomain) {
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// Serve raw content from RawDomain
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log.Debug().Msg("raw domain")
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targetOptions.TryIndexPages = false
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targetOptions.ForbiddenMimeTypes["text/html"] = struct{}{}
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targetOptions.DefaultMimeType = "text/plain; charset=utf-8"
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pathElements := strings.Split(string(bytes.Trim(ctx.Request.URI().Path(), "/")), "/")
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if len(pathElements) < 2 {
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// https://{RawDomain}/{owner}/{repo}[/@{branch}]/{path} is required
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ctx.Redirect(rawInfoPage, fasthttp.StatusTemporaryRedirect)
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return
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}
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targetOwner = pathElements[0]
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targetRepo = pathElements[1]
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// raw.codeberg.org/example/myrepo/@main/index.html
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if len(pathElements) > 2 && strings.HasPrefix(pathElements[2], "@") {
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log.Debug().Msg("raw domain preparations, now trying with specified branch")
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if tryBranch(targetRepo, pathElements[2][1:], pathElements[3:],
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giteaRoot+"/"+targetOwner+"/"+targetRepo+"/src/branch/%b/%p",
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) {
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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return
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}
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log.Debug().Msg("missing branch")
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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return
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} else {
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log.Debug().Msg("raw domain preparations, now trying with default branch")
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tryBranch(targetRepo, "", pathElements[2:],
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giteaRoot+"/"+targetOwner+"/"+targetRepo+"/src/branch/%b/%p",
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)
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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return
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}
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} else if bytes.HasSuffix(trimmedHost, mainDomainSuffix) {
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// Serve pages from subdomains of MainDomainSuffix
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log.Debug().Msg("main domain suffix")
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pathElements := strings.Split(string(bytes.Trim(ctx.Request.URI().Path(), "/")), "/")
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targetOwner = string(bytes.TrimSuffix(trimmedHost, mainDomainSuffix))
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targetRepo = pathElements[0]
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targetPath = strings.Trim(strings.Join(pathElements[1:], "/"), "/")
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if targetOwner == "www" {
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// www.codeberg.page redirects to codeberg.page
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ctx.Redirect("https://"+string(mainDomainSuffix[1:])+string(ctx.Path()), fasthttp.StatusPermanentRedirect)
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return
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}
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// Check if the first directory is a repo with the second directory as a branch
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// example.codeberg.page/myrepo/@main/index.html
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if len(pathElements) > 1 && strings.HasPrefix(pathElements[1], "@") {
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if targetRepo == "pages" {
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// example.codeberg.org/pages/@... redirects to example.codeberg.org/@...
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ctx.Redirect("/"+strings.Join(pathElements[1:], "/"), fasthttp.StatusTemporaryRedirect)
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return
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}
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log.Debug().Msg("main domain preparations, now trying with specified repo & branch")
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if tryBranch(pathElements[0], pathElements[1][1:], pathElements[2:],
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"/"+pathElements[0]+"/%p",
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) {
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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} else {
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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}
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return
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}
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// Check if the first directory is a branch for the "pages" repo
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// example.codeberg.page/@main/index.html
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if strings.HasPrefix(pathElements[0], "@") {
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log.Debug().Msg("main domain preparations, now trying with specified branch")
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if tryBranch("pages", pathElements[0][1:], pathElements[1:], "/%p") {
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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} else {
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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}
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return
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}
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// Check if the first directory is a repo with a "pages" branch
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// example.codeberg.page/myrepo/index.html
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// example.codeberg.page/pages/... is not allowed here.
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log.Debug().Msg("main domain preparations, now trying with specified repo")
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if pathElements[0] != "pages" && tryBranch(pathElements[0], "pages", pathElements[1:], "") {
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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return
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}
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// Try to use the "pages" repo on its default branch
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// example.codeberg.page/index.html
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log.Debug().Msg("main domain preparations, now trying with default repo/branch")
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if tryBranch("pages", "", pathElements, "") {
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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return
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}
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// Couldn't find a valid repo/branch
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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return
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} else {
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trimmedHostStr := string(trimmedHost)
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// Serve pages from external domains
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targetOwner, targetRepo, targetBranch = getTargetFromDNS(trimmedHostStr, string(mainDomainSuffix))
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if targetOwner == "" {
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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return
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}
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pathElements := strings.Split(string(bytes.Trim(ctx.Request.URI().Path(), "/")), "/")
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canonicalLink := ""
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if strings.HasPrefix(pathElements[0], "@") {
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targetBranch = pathElements[0][1:]
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pathElements = pathElements[1:]
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canonicalLink = "/%p"
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}
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// Try to use the given repo on the given branch or the default branch
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log.Debug().Msg("custom domain preparations, now trying with details from DNS")
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if tryBranch(targetRepo, targetBranch, pathElements, canonicalLink) {
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canonicalDomain, valid := checkCanonicalDomain(targetOwner, targetRepo, targetBranch, trimmedHostStr, string(mainDomainSuffix), giteaRoot, giteaApiToken)
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if !valid {
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returnErrorPage(ctx, fasthttp.StatusMisdirectedRequest)
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return
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} else if canonicalDomain != trimmedHostStr {
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// only redirect if the target is also a codeberg page!
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targetOwner, _, _ = getTargetFromDNS(strings.SplitN(canonicalDomain, "/", 2)[0], string(mainDomainSuffix))
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if targetOwner != "" {
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ctx.Redirect("https://"+canonicalDomain+string(ctx.RequestURI()), fasthttp.StatusTemporaryRedirect)
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return
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} else {
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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return
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}
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}
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log.Debug().Msg("tryBranch, now trying upstream")
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tryUpstream()
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return
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} else {
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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return
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}
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}
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}
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}
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// returnErrorPage sets the response status code and writes NotFoundPage to the response body, with "%status" replaced
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// with the provided status code.
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func returnErrorPage(ctx *fasthttp.RequestCtx, code int) {
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ctx.Response.SetStatusCode(code)
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ctx.Response.Header.SetContentType("text/html; charset=utf-8")
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message := fasthttp.StatusMessage(code)
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if code == fasthttp.StatusMisdirectedRequest {
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message += " - domain not specified in <code>.domains</code> file"
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}
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if code == fasthttp.StatusFailedDependency {
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message += " - target repo/branch doesn't exist or is private"
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}
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// TODO: use template engine?
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ctx.Response.SetBody(bytes.ReplaceAll(html.NotFoundPage, []byte("%status"), []byte(strconv.Itoa(code)+" "+message)))
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}
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// DefaultBranchCacheTimeout specifies the timeout for the default branch cache. It can be quite long.
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var DefaultBranchCacheTimeout = 15 * time.Minute
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// BranchExistanceCacheTimeout specifies the timeout for the branch timestamp & existance cache. It should be shorter
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// than FileCacheTimeout, as that gets invalidated if the branch timestamp has changed. That way, repo changes will be
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// picked up faster, while still allowing the content to be cached longer if nothing changes.
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var BranchExistanceCacheTimeout = 5 * time.Minute
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// branchTimestampCache stores branch timestamps for faster cache checking
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var branchTimestampCache = mcache.New()
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type branchTimestamp struct {
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branch string
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timestamp time.Time
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}
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// FileCacheTimeout specifies the timeout for the file content cache - you might want to make this quite long, depending
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// on your available memory.
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var FileCacheTimeout = 5 * time.Minute
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// FileCacheSizeLimit limits the maximum file size that will be cached, and is set to 1 MB by default.
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var FileCacheSizeLimit = 1024 * 1024
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// fileResponseCache stores responses from the Gitea server
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// TODO: make this an MRU cache with a size limit
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var fileResponseCache = mcache.New()
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type fileResponse struct {
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exists bool
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mimeType string
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body []byte
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}
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// getBranchTimestamp finds the default branch (if branch is "") and returns the last modification time of the branch
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// (or nil if the branch doesn't exist)
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func getBranchTimestamp(owner, repo, branch, giteaRoot, giteaApiToken string) *branchTimestamp {
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if result, ok := branchTimestampCache.Get(owner + "/" + repo + "/" + branch); ok {
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if result == nil {
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return nil
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}
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return result.(*branchTimestamp)
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}
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result := &branchTimestamp{}
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result.branch = branch
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if branch == "" {
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// Get default branch
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var body = make([]byte, 0)
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// TODO: use header for API key?
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status, body, err := fasthttp.GetTimeout(body, giteaRoot+"/api/v1/repos/"+owner+"/"+repo+"?access_token="+giteaApiToken, 5*time.Second)
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if err != nil || status != 200 {
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_ = branchTimestampCache.Set(owner+"/"+repo+"/"+branch, nil, DefaultBranchCacheTimeout)
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return nil
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}
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result.branch = fastjson.GetString(body, "default_branch")
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}
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var body = make([]byte, 0)
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status, body, err := fasthttp.GetTimeout(body, giteaRoot+"/api/v1/repos/"+owner+"/"+repo+"/branches/"+branch+"?access_token="+giteaApiToken, 5*time.Second)
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if err != nil || status != 200 {
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return nil
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}
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result.timestamp, _ = time.Parse(time.RFC3339, fastjson.GetString(body, "commit", "timestamp"))
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_ = branchTimestampCache.Set(owner+"/"+repo+"/"+branch, result, BranchExistanceCacheTimeout)
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return result
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}
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var upstreamClient = fasthttp.Client{
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ReadTimeout: 10 * time.Second,
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MaxConnDuration: 60 * time.Second,
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MaxConnWaitTimeout: 1000 * time.Millisecond,
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MaxConnsPerHost: 128 * 16, // TODO: adjust bottlenecks for best performance with Gitea!
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}
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// upstreamIndexPages lists pages that may be considered as index pages for directories.
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var upstreamIndexPages = []string{
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"index.html",
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}
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// upstream requests a file from the Gitea API at GiteaRoot and writes it to the request context.
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func upstream(ctx *fasthttp.RequestCtx, targetOwner, targetRepo, targetBranch, targetPath, giteaRoot, giteaApiToken string, options *upstreamOptions) (final bool) {
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log := log.With().Strs("upstream", []string{targetOwner, targetRepo, targetBranch, targetPath}).Logger()
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if options.ForbiddenMimeTypes == nil {
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options.ForbiddenMimeTypes = map[string]struct{}{}
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}
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// Check if the branch exists and when it was modified
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if options.BranchTimestamp == (time.Time{}) {
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branch := getBranchTimestamp(targetOwner, targetRepo, targetBranch, giteaRoot, giteaApiToken)
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if branch == nil {
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returnErrorPage(ctx, fasthttp.StatusFailedDependency)
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return true
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}
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targetBranch = branch.branch
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options.BranchTimestamp = branch.timestamp
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}
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if targetOwner == "" || targetRepo == "" || targetBranch == "" {
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returnErrorPage(ctx, fasthttp.StatusBadRequest)
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return true
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}
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// Check if the browser has a cached version
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if ifModifiedSince, err := time.Parse(time.RFC1123, string(ctx.Request.Header.Peek("If-Modified-Since"))); err == nil {
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if !ifModifiedSince.Before(options.BranchTimestamp) {
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ctx.Response.SetStatusCode(fasthttp.StatusNotModified)
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return true
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}
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}
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log.Debug().Msg("preparations")
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// Make a GET request to the upstream URL
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uri := targetOwner + "/" + targetRepo + "/raw/" + targetBranch + "/" + targetPath
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var req *fasthttp.Request
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var res *fasthttp.Response
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var cachedResponse fileResponse
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var err error
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if cachedValue, ok := fileResponseCache.Get(uri + "?timestamp=" + strconv.FormatInt(options.BranchTimestamp.Unix(), 10)); ok && len(cachedValue.(fileResponse).body) > 0 {
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cachedResponse = cachedValue.(fileResponse)
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} else {
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req = fasthttp.AcquireRequest()
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req.SetRequestURI(giteaRoot + "/api/v1/repos/" + uri + "?access_token=" + giteaApiToken)
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res = fasthttp.AcquireResponse()
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res.SetBodyStream(&strings.Reader{}, -1)
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err = upstreamClient.Do(req, res)
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}
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log.Debug().Msg("acquisition")
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// Handle errors
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if (res == nil && !cachedResponse.exists) || (res != nil && res.StatusCode() == fasthttp.StatusNotFound) {
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if options.TryIndexPages {
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// copy the options struct & try if an index page exists
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optionsForIndexPages := *options
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optionsForIndexPages.TryIndexPages = false
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optionsForIndexPages.AppendTrailingSlash = true
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for _, indexPage := range upstreamIndexPages {
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if upstream(ctx, targetOwner, targetRepo, targetBranch, strings.TrimSuffix(targetPath, "/")+"/"+indexPage, giteaRoot, giteaApiToken, &optionsForIndexPages) {
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_ = fileResponseCache.Set(uri+"?timestamp="+strconv.FormatInt(options.BranchTimestamp.Unix(), 10), fileResponse{
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exists: false,
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}, FileCacheTimeout)
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return true
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}
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}
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// compatibility fix for GitHub Pages (/example → /example.html)
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optionsForIndexPages.AppendTrailingSlash = false
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optionsForIndexPages.RedirectIfExists = string(ctx.Request.URI().Path()) + ".html"
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if upstream(ctx, targetOwner, targetRepo, targetBranch, targetPath+".html", giteaRoot, giteaApiToken, &optionsForIndexPages) {
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_ = fileResponseCache.Set(uri+"?timestamp="+strconv.FormatInt(options.BranchTimestamp.Unix(), 10), fileResponse{
|
|
exists: false,
|
|
}, FileCacheTimeout)
|
|
return true
|
|
}
|
|
}
|
|
ctx.Response.SetStatusCode(fasthttp.StatusNotFound)
|
|
if res != nil {
|
|
// Update cache if the request is fresh
|
|
_ = fileResponseCache.Set(uri+"?timestamp="+strconv.FormatInt(options.BranchTimestamp.Unix(), 10), fileResponse{
|
|
exists: false,
|
|
}, FileCacheTimeout)
|
|
}
|
|
return false
|
|
}
|
|
if res != nil && (err != nil || res.StatusCode() != fasthttp.StatusOK) {
|
|
fmt.Printf("Couldn't fetch contents from \"%s\": %s (status code %d)\n", req.RequestURI(), err, res.StatusCode())
|
|
returnErrorPage(ctx, fasthttp.StatusInternalServerError)
|
|
return true
|
|
}
|
|
|
|
// Append trailing slash if missing (for index files), and redirect to fix filenames in general
|
|
// options.AppendTrailingSlash is only true when looking for index pages
|
|
if options.AppendTrailingSlash && !bytes.HasSuffix(ctx.Request.URI().Path(), []byte{'/'}) {
|
|
ctx.Redirect(string(ctx.Request.URI().Path())+"/", fasthttp.StatusTemporaryRedirect)
|
|
return true
|
|
}
|
|
if bytes.HasSuffix(ctx.Request.URI().Path(), []byte("/index.html")) {
|
|
ctx.Redirect(strings.TrimSuffix(string(ctx.Request.URI().Path()), "index.html"), fasthttp.StatusTemporaryRedirect)
|
|
return true
|
|
}
|
|
if options.RedirectIfExists != "" {
|
|
ctx.Redirect(options.RedirectIfExists, fasthttp.StatusTemporaryRedirect)
|
|
return true
|
|
}
|
|
log.Debug().Msg("error handling")
|
|
|
|
// Set the MIME type
|
|
mimeType := mime.TypeByExtension(path.Ext(targetPath))
|
|
mimeTypeSplit := strings.SplitN(mimeType, ";", 2)
|
|
if _, ok := options.ForbiddenMimeTypes[mimeTypeSplit[0]]; ok || mimeType == "" {
|
|
if options.DefaultMimeType != "" {
|
|
mimeType = options.DefaultMimeType
|
|
} else {
|
|
mimeType = "application/octet-stream"
|
|
}
|
|
}
|
|
ctx.Response.Header.SetContentType(mimeType)
|
|
|
|
// Everything's okay so far
|
|
ctx.Response.SetStatusCode(fasthttp.StatusOK)
|
|
ctx.Response.Header.SetLastModified(options.BranchTimestamp)
|
|
|
|
log.Debug().Msg("response preparations")
|
|
|
|
// Write the response body to the original request
|
|
var cacheBodyWriter bytes.Buffer
|
|
if res != nil {
|
|
if res.Header.ContentLength() > FileCacheSizeLimit {
|
|
err = res.BodyWriteTo(ctx.Response.BodyWriter())
|
|
} else {
|
|
// TODO: cache is half-empty if request is cancelled - does the ctx.Err() below do the trick?
|
|
err = res.BodyWriteTo(io.MultiWriter(ctx.Response.BodyWriter(), &cacheBodyWriter))
|
|
}
|
|
} else {
|
|
_, err = ctx.Write(cachedResponse.body)
|
|
}
|
|
if err != nil {
|
|
fmt.Printf("Couldn't write body for \"%s\": %s\n", req.RequestURI(), err)
|
|
returnErrorPage(ctx, fasthttp.StatusInternalServerError)
|
|
return true
|
|
}
|
|
log.Debug().Msg("response")
|
|
|
|
if res != nil && ctx.Err() == nil {
|
|
cachedResponse.exists = true
|
|
cachedResponse.mimeType = mimeType
|
|
cachedResponse.body = cacheBodyWriter.Bytes()
|
|
_ = fileResponseCache.Set(uri+"?timestamp="+strconv.FormatInt(options.BranchTimestamp.Unix(), 10), cachedResponse, FileCacheTimeout)
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// upstreamOptions provides various options for the upstream request.
|
|
type upstreamOptions struct {
|
|
DefaultMimeType string
|
|
ForbiddenMimeTypes map[string]struct{}
|
|
TryIndexPages bool
|
|
AppendTrailingSlash bool
|
|
RedirectIfExists string
|
|
BranchTimestamp time.Time
|
|
}
|