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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 {
handle := packageHandler{
pkgName: name,
pkg: pkg,
config: config,
}
// Double-register so that "/foo"
// does not redirect to "/foo/" with a 300.
mux.Handle("/"+name, &handle)
mux.Handle("/"+name+"/", &handle)
}
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 {
pkgName string
pkg Package
config *Config
}
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.pkgName)
baseURL := h.config.URL
if h.pkg.URL != "" {
baseURL = h.pkg.URL
}
canonicalURL := fmt.Sprintf("%s/%s", baseURL, h.pkgName)
data := struct {
Repo string
Branch string
CanonicalURL string
GodocURL string
}{
Repo: h.pkg.Repo,
Branch: h.pkg.Branch,
CanonicalURL: canonicalURL,
GodocURL: fmt.Sprintf("https://%s/%s%s", h.config.Godoc.Host, canonicalURL, relPath),
}
if err := packageTemplate.Execute(w, data); err != nil {
http.Error(w, err.Error(), 500)
}
}
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