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package main
import (
"fmt"
"html/template"
"net/http"
"strings"
"go.uber.org/sally/templates"
)
var (
indexTemplate = template.Must(
template.New("index.html").Parse(templates.Index))
packageTemplate = template.Must(
template.New("package.html").Parse(templates.Package))
)
// CreateHandler creates a Sally http.Handler
func CreateHandler(config *Config) http.Handler {
mux := http.NewServeMux()
mux.Handle("/", &indexHandler{config: config})
for name, pkg := range config.Packages {
handler := newPackageHandler(config, name, pkg)
// Double-register so that "/foo"
// does not redirect to "/foo/" with a 300.
mux.Handle("/"+name, handler)
mux.Handle("/"+name+"/", handler)
}
return mux
}
type indexHandler struct {
config *Config
}
func (h *indexHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Index handler only supports '/'.
// ServeMux will call us for any '/foo' that is not a known package.
if r.Method != http.MethodGet || r.URL.Path != "/" {
http.NotFound(w, r)
return
}
if err := indexTemplate.Execute(w, h.config); err != nil {
http.Error(w, err.Error(), 500)
}
}
type packageHandler struct {
// Hostname of the godoc server, e.g. "godoc.org".
godocHost string
// Name of the package relative to the vanity base URL.
// For example, "zap" for "go.uber.org/zap".
name string
// Path at which the Git repository is hosted.
// For example, "github.com/uber-go/zap".
gitURL string
// Default branch of the Git repository.
defaultBranch string
// Canonical import path for the package.
canonicalURL string
}
func newPackageHandler(cfg *Config, name string, pkg PackageConfig) *packageHandler {
baseURL := cfg.URL
if pkg.URL != "" {
baseURL = pkg.URL
}
canonicalURL := fmt.Sprintf("%s/%s", baseURL, name)
return &packageHandler{
godocHost: cfg.Godoc.Host,
name: name,
canonicalURL: canonicalURL,
gitURL: pkg.Repo,
defaultBranch: pkg.Branch,
}
}
func (h *packageHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.NotFound(w, r)
return
}
// Extract the relative path to subpackages, if any.
// "/foo/bar" => "/bar"
// "/foo" => ""
relPath := strings.TrimPrefix(r.URL.Path, "/"+h.name)
data := struct {
Repo string
Branch string
CanonicalURL string
GodocURL string
}{
Repo: h.gitURL,
Branch: h.defaultBranch,
CanonicalURL: h.canonicalURL,
GodocURL: fmt.Sprintf("https://%s/%s%s", h.godocHost, h.canonicalURL, relPath),
}
if err := packageTemplate.Execute(w, data); err != nil {
http.Error(w, err.Error(), 500)
}
}
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