275 lines
9.7 KiB
Go
275 lines
9.7 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"github.com/valyala/fasthttp"
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"github.com/valyala/fastjson"
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"mime"
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"net/url"
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"path"
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"strconv"
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"strings"
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"time"
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)
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// handler handles a single HTTP request to the web server.
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func handler(ctx *fasthttp.RequestCtx) {
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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 caching, but require revalidation to reduce confusion
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ctx.Response.Header.Set("Cache-Control", "must-revalidate")
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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(ctx.Request.Host(), 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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if RawDomain != nil && bytes.Equal(ctx.Request.Host(), RawDomain) {
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// Serve raw content from RawDomain
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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.SplitN(string(bytes.Trim(ctx.Request.URI().Path(), "/")), "/", 4)
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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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if len(pathElements) > 3 {
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targetPath = strings.Trim(pathElements[2]+"/"+pathElements[3], "/")
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} else if len(pathElements) > 2 {
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targetPath = pathElements[2]
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}
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// raw.codeberg.page/example/myrepo/@main/index.html
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if len(pathElements) > 3 && strings.HasPrefix(pathElements[2], "@") {
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branch, _ := url.PathUnescape(pathElements[2][1:])
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if branch == "" {
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branch = pathElements[2][1:]
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}
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// Check if the branch exists, otherwise treat it as a file path
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targetBranch, targetOptions.BranchTimestamp = getBranchTimestamp(targetOwner, targetRepo, branch)
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if targetOptions.BranchTimestamp != (time.Time{}) {
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targetPath = strings.Trim(pathElements[3], "/") // branch exists, use it
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} else {
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targetBranch = "" // branch doesn't exist, use default branch
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}
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}
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} else if bytes.HasSuffix(ctx.Request.Host(), MainDomainSuffix) {
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// Serve pages from subdomains of MainDomainSuffix
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pathElements := strings.SplitN(string(bytes.Trim(ctx.Request.URI().Path(), "/")), "/", 2)
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targetOwner = string(bytes.TrimSuffix(ctx.Request.Host(), MainDomainSuffix))
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targetRepo = pathElements[0]
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if len(pathElements) > 1 {
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targetPath = strings.Trim(pathElements[1], "/")
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}
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// Check if the first directory is a repo with a "pages" branch
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targetBranch, targetOptions.BranchTimestamp = getBranchTimestamp(targetOwner, targetRepo, "pages")
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if targetOptions.BranchTimestamp == (time.Time{}) {
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targetRepo = "pages"
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targetBranch = ""
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targetPath = strings.Trim(pathElements[0]+"/"+targetPath, "/")
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}
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} else {
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// Serve pages from external domains
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targetOwner, targetRepo, targetBranch, targetPath = getTargetFromDNS(ctx)
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if targetOwner == "" {
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ctx.Redirect(BrokenDNSPage, fasthttp.StatusTemporaryRedirect)
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return
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}
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}
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// Check if a username can't exist because it's reserved (we'd risk to hit a Gitea route in that case)
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if _, ok := ReservedUsernames[targetOwner]; ok {
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returnErrorPage(ctx, fasthttp.StatusForbidden)
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return
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}
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// Check for blob path
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if strings.HasPrefix(targetPath, "blob/") {
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returnErrorPage(ctx, fasthttp.StatusForbidden)
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return
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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, targetOptions) {
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returnErrorPage(ctx, ctx.Response.StatusCode())
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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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ctx.Response.SetBody(bytes.ReplaceAll(NotFoundPage, []byte("%status"), []byte(strconv.Itoa(code) + " " + fasthttp.StatusMessage(code))))
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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 an empty time.Time if the branch doesn't exist)
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func getBranchTimestamp(owner, repo, branch string) (branchWithFallback string, t time.Time) {
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branchWithFallback = branch
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if branch == "" {
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var body = make([]byte, 0)
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status, body, err := fasthttp.GetTimeout(body, string(GiteaRoot)+"/api/v1/repos/"+owner+"/"+repo, 10*time.Second)
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if err != nil || status != 200 {
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branchWithFallback = ""
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return
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}
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branch = fastjson.GetString(body, "default_branch")
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branchWithFallback = branch
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}
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var body = make([]byte, 0)
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status, body, err := fasthttp.GetTimeout(body, string(GiteaRoot)+"/api/v1/repos/"+owner+"/"+repo+"/branches/"+branch, 10*time.Second)
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if err != nil || status != 200 {
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branchWithFallback = ""
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return
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}
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t, _ = time.Parse(time.RFC3339, fastjson.GetString(body, "commit", "timestamp"))
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return
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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 string, targetRepo string, targetBranch string, targetPath string, options *upstreamOptions) (success bool) {
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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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targetBranch, options.BranchTimestamp = getBranchTimestamp(targetOwner, targetRepo, targetBranch)
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}
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// Handle repositories with no/broken pages setup
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if options.BranchTimestamp == (time.Time{}) || targetBranch == "" {
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ctx.Response.SetStatusCode(fasthttp.StatusNotFound)
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ctx.Response.Header.SetContentType("text/html; charset=utf-8")
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ctx.Response.SetBody(bytes.ReplaceAll(NotFoundPage, []byte("%status"), []byte("pages not set up for this repo")))
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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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// Make a GET request to the upstream URL
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req := fasthttp.AcquireRequest()
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req.SetRequestURI(string(GiteaRoot) + "/api/v1/repos/" + targetOwner + "/" + targetRepo + "/raw/" + targetBranch + "/" + targetPath)
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res := fasthttp.AcquireResponse()
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err := fasthttp.DoTimeout(req, res, 10*time.Second)
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// Handle errors
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if 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 IndexPages {
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if upstream(ctx, targetOwner, targetRepo, targetBranch, strings.TrimSuffix(targetPath, "/")+"/"+indexPage, &optionsForIndexPages) {
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return true
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}
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}
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}
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ctx.Response.SetStatusCode(fasthttp.StatusNotFound)
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return false
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}
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if err != nil || res.StatusCode() != fasthttp.StatusOK {
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fmt.Printf("Couldn't fetch contents from \"%s\": %s (status code %d)\n", req.RequestURI(), err, res.StatusCode())
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returnErrorPage(ctx, fasthttp.StatusInternalServerError)
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return true
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}
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// Append trailing slash if missing (for index files)
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if options.AppendTrailingSlash && !bytes.HasSuffix(ctx.Request.URI().Path(), []byte{'/'}) {
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ctx.Redirect(string(ctx.Request.URI().Path())+"/", fasthttp.StatusTemporaryRedirect)
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return true
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}
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// Set the MIME type
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mimeType := mime.TypeByExtension(path.Ext(targetPath))
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mimeTypeSplit := strings.SplitN(mimeType, ";", 2)
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if _, ok := options.ForbiddenMimeTypes[mimeTypeSplit[0]]; ok || mimeType == "" {
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if options.DefaultMimeType != "" {
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mimeType = options.DefaultMimeType
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} else {
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mimeType = "application/octet-stream"
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}
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}
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ctx.Response.Header.SetContentType(mimeType)
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// Write the response to the original request
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ctx.Response.SetStatusCode(fasthttp.StatusOK)
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ctx.Response.Header.SetLastModified(options.BranchTimestamp)
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err = res.BodyWriteTo(ctx.Response.BodyWriter())
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if err != nil {
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fmt.Printf("Couldn't write body for \"%s\": %s\n", req.RequestURI(), err)
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returnErrorPage(ctx, fasthttp.StatusInternalServerError)
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return true
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}
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return true
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}
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// upstreamOptions provides various options for the upstream request.
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type upstreamOptions struct {
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DefaultMimeType string
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ForbiddenMimeTypes map[string]struct{}
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TryIndexPages bool
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AppendTrailingSlash bool
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BranchTimestamp time.Time
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}
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