pages-server/server/handler/handler_sub_domain.go
Gusted 15916444e1 Fix panic in formatting not found message (#276)
Fix panic that was found in the logs, `targetOpt` is `nil`:

http2: panic serving 10.0.3.1:[...]: runtime error: invalid memory address or nil pointer dereference
net/http.(*http2serverConn).runHandler.func1()
        /usr/local/go/src/net/http/h2_bundle.go:6104 +0x145
panic({0x19c6820, 0x2d66db0})
        /usr/local/go/src/runtime/panic.go:884 +0x213
codeberg.org/codeberg/pages/server/handler.handleSubDomain({{0x2008c68, 0xc00047df90}, 0x2, {0x0, 0x0}, {0xc0fe3ef800, 0x55, 0x1f4}, {0xc00047dfa0, 0x1, ...}, ...}, ...)
        /woodpecker/src/codeberg.org/Codeberg/pages-server/server/handler/handler_sub_domain.go:59 +0x5e0

Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/276
Reviewed-by: crapStone <codeberg@crapstone.dev>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>
2024-01-18 14:31:46 +00:00

156 lines
5.7 KiB
Go

package handler
import (
"fmt"
"net/http"
"path"
"strings"
"github.com/rs/zerolog"
"golang.org/x/exp/slices"
"codeberg.org/codeberg/pages/html"
"codeberg.org/codeberg/pages/server/cache"
"codeberg.org/codeberg/pages/server/context"
"codeberg.org/codeberg/pages/server/gitea"
"codeberg.org/codeberg/pages/server/upstream"
)
func handleSubDomain(log zerolog.Logger, ctx *context.Context, giteaClient *gitea.Client,
mainDomainSuffix string,
defaultPagesBranches []string,
trimmedHost string,
pathElements []string,
canonicalDomainCache, redirectsCache cache.SetGetKey,
) {
// Serve pages from subdomains of MainDomainSuffix
log.Debug().Msg("main domain suffix")
targetOwner := strings.TrimSuffix(trimmedHost, mainDomainSuffix)
targetRepo := pathElements[0]
if targetOwner == "www" {
// www.codeberg.page redirects to codeberg.page // TODO: rm hardcoded - use cname?
ctx.Redirect("https://"+mainDomainSuffix[1:]+ctx.Path(), http.StatusPermanentRedirect)
return
}
// Check if the first directory is a repo with the second directory as a branch
// example.codeberg.page/myrepo/@main/index.html
if len(pathElements) > 1 && strings.HasPrefix(pathElements[1], "@") {
if targetRepo == defaultPagesRepo {
// example.codeberg.org/pages/@... redirects to example.codeberg.org/@...
ctx.Redirect("/"+strings.Join(pathElements[1:], "/"), http.StatusTemporaryRedirect)
return
}
log.Debug().Msg("main domain preparations, now trying with specified repo & branch")
if targetOpt, works := tryBranch(log, ctx, giteaClient, &upstream.Options{
TryIndexPages: true,
TargetOwner: targetOwner,
TargetRepo: pathElements[0],
TargetBranch: pathElements[1][1:],
TargetPath: path.Join(pathElements[2:]...),
}, true); works {
log.Trace().Msg("tryUpstream: serve with specified repo and branch")
tryUpstream(ctx, giteaClient, mainDomainSuffix, trimmedHost, targetOpt, canonicalDomainCache, redirectsCache)
} else {
html.ReturnErrorPage(
ctx,
formatSetBranchNotFoundMessage(pathElements[1][1:], targetOwner, pathElements[0]),
http.StatusFailedDependency,
)
}
return
}
// Check if the first directory is a branch for the defaultPagesRepo
// example.codeberg.page/@main/index.html
if strings.HasPrefix(pathElements[0], "@") {
targetBranch := pathElements[0][1:]
// if the default pages branch can be determined exactly, it does not need to be set
if len(defaultPagesBranches) == 1 && slices.Contains(defaultPagesBranches, targetBranch) {
// example.codeberg.org/@pages/... redirects to example.codeberg.org/...
ctx.Redirect("/"+strings.Join(pathElements[1:], "/"), http.StatusTemporaryRedirect)
return
}
log.Debug().Msg("main domain preparations, now trying with specified branch")
if targetOpt, works := tryBranch(log, ctx, giteaClient, &upstream.Options{
TryIndexPages: true,
TargetOwner: targetOwner,
TargetRepo: defaultPagesRepo,
TargetBranch: targetBranch,
TargetPath: path.Join(pathElements[1:]...),
}, true); works {
log.Trace().Msg("tryUpstream: serve default pages repo with specified branch")
tryUpstream(ctx, giteaClient, mainDomainSuffix, trimmedHost, targetOpt, canonicalDomainCache, redirectsCache)
} else {
html.ReturnErrorPage(
ctx,
formatSetBranchNotFoundMessage(targetBranch, targetOwner, defaultPagesRepo),
http.StatusFailedDependency,
)
}
return
}
for _, defaultPagesBranch := range defaultPagesBranches {
// Check if the first directory is a repo with a default pages branch
// example.codeberg.page/myrepo/index.html
// example.codeberg.page/{PAGES_BRANCHE}/... is not allowed here.
log.Debug().Msg("main domain preparations, now trying with specified repo")
if pathElements[0] != defaultPagesBranch {
if targetOpt, works := tryBranch(log, ctx, giteaClient, &upstream.Options{
TryIndexPages: true,
TargetOwner: targetOwner,
TargetRepo: pathElements[0],
TargetBranch: defaultPagesBranch,
TargetPath: path.Join(pathElements[1:]...),
}, false); works {
log.Debug().Msg("tryBranch, now trying upstream 5")
tryUpstream(ctx, giteaClient, mainDomainSuffix, trimmedHost, targetOpt, canonicalDomainCache, redirectsCache)
return
}
}
// Try to use the defaultPagesRepo on an default pages branch
// example.codeberg.page/index.html
log.Debug().Msg("main domain preparations, now trying with default repo")
if targetOpt, works := tryBranch(log, ctx, giteaClient, &upstream.Options{
TryIndexPages: true,
TargetOwner: targetOwner,
TargetRepo: defaultPagesRepo,
TargetBranch: defaultPagesBranch,
TargetPath: path.Join(pathElements...),
}, false); works {
log.Debug().Msg("tryBranch, now trying upstream 6")
tryUpstream(ctx, giteaClient, mainDomainSuffix, trimmedHost, targetOpt, canonicalDomainCache, redirectsCache)
return
}
}
// Try to use the defaultPagesRepo on its default branch
// example.codeberg.page/index.html
log.Debug().Msg("main domain preparations, now trying with default repo/branch")
if targetOpt, works := tryBranch(log, ctx, giteaClient, &upstream.Options{
TryIndexPages: true,
TargetOwner: targetOwner,
TargetRepo: defaultPagesRepo,
TargetPath: path.Join(pathElements...),
}, false); works {
log.Debug().Msg("tryBranch, now trying upstream 6")
tryUpstream(ctx, giteaClient, mainDomainSuffix, trimmedHost, targetOpt, canonicalDomainCache, redirectsCache)
return
}
// Couldn't find a valid repo/branch
html.ReturnErrorPage(ctx,
fmt.Sprintf("could not find a valid repository or branch for repository: <code>%s</code>", targetRepo),
http.StatusNotFound)
}
func formatSetBranchNotFoundMessage(branch, owner, repo string) string {
return fmt.Sprintf("explicitly set branch <code>%q</code> does not exist at <code>%s/%s</code>", branch, owner, repo)
}