Implement index handler

This involved re-arranging how templates are being parsed, slightly.

5 files changed, 108 insertions, 21 deletions

diff --git a/srv/src/api/api.go b/srv/src/api/api.go
index 92771a1..79979be 100644
--- a/srv/src/api/api.go
+++ b/srv/src/api/api.go
@@ -3,10 +3,8 @@ package api
 
 import (
 	"context"
-	"embed"
 	"errors"
 	"fmt"
-	"html/template"
 	"net"
 	"net/http"
 	"net/http/httputil"
@@ -22,11 +20,6 @@ import (
 	"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
 )
 
-//go:embed tpl
-var fs embed.FS
-
-var tpls = template.Must(template.ParseFS(fs, "tpl/*"))
-
 // Params are used to instantiate a new API instance. All fields are required
 // unless otherwise noted.
 type Params struct {
@@ -184,10 +177,9 @@ func (a *api) handler() http.Handler {
 	)))
 
 	var apiHandler http.Handler = apiMux
-	apiHandler = postOnlyMiddleware(apiHandler) // TODO probably should be last?
 	apiHandler = checkCSRFMiddleware(apiHandler)
-	apiHandler = logMiddleware(a.params.Logger, apiHandler)
-	apiHandler = annotateMiddleware(apiHandler)
+	apiHandler = postOnlyMiddleware(apiHandler)
+	apiHandler = logReqMiddleware(apiHandler)
 	apiHandler = addResponseHeaders(map[string]string{
 		"Cache-Control": "no-store, max-age=0",
 		"Pragma":        "no-cache",
@@ -196,7 +188,12 @@ func (a *api) handler() http.Handler {
 
 	mux.Handle("/api/", http.StripPrefix("/api", apiHandler))
 
-	mux.Handle("/v2/posts/", a.postHandler())
+	// TODO need to setCSRFMiddleware on all these rendering endpoints
+	mux.Handle("/v2/posts/", a.renderPostHandler())
+	mux.Handle("/v2/", a.renderIndexHandler())
+
+	var globalHandler http.Handler = mux
+	globalHandler = setLoggerMiddleware(a.params.Logger, globalHandler)
 
-	return mux
+	return globalHandler
 }
diff --git a/srv/src/api/middleware.go b/srv/src/api/middleware.go
index 0b3eec7..fcd29b3 100644
--- a/srv/src/api/middleware.go
+++ b/srv/src/api/middleware.go
@@ -19,7 +19,7 @@ func addResponseHeaders(headers map[string]string, h http.Handler) http.Handler
 	})
 }
 
-func annotateMiddleware(h http.Handler) http.Handler {
+func setLoggerMiddleware(logger *mlog.Logger, h http.Handler) http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 
 		type reqInfoKey string
@@ -34,6 +34,7 @@ func annotateMiddleware(h http.Handler) http.Handler {
 		)
 
 		r = r.WithContext(ctx)
+		r = apiutil.SetRequestLogger(r, logger)
 		h.ServeHTTP(rw, r)
 	})
 }
@@ -58,11 +59,9 @@ func (lrw *logResponseWriter) WriteHeader(statusCode int) {
 	lrw.ResponseWriter.WriteHeader(statusCode)
 }
 
-func logMiddleware(logger *mlog.Logger, h http.Handler) http.Handler {
+func logReqMiddleware(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 
-		r = apiutil.SetRequestLogger(r, logger)
-
 		lrw := newLogResponseWriter(rw)
 
 		started := time.Now()
@@ -77,7 +76,7 @@ func logMiddleware(logger *mlog.Logger, h http.Handler) http.Handler {
 			logCtxKey("response_code"), lrw.statusCode,
 		)
 
-		logger.Info(ctx, "handled HTTP request")
+		apiutil.GetRequestLogger(r).Info(ctx, "handled HTTP request")
 	})
 }
 
diff --git a/srv/src/api/posts.go b/srv/src/api/render.go
index cc7a176..b2ca3c8 100644
--- a/srv/src/api/posts.go
+++ b/srv/src/api/render.go
@@ -1,9 +1,11 @@
 package api
 
 import (
+	"embed"
 	"errors"
 	"fmt"
 	"html/template"
+	"io/fs"
 	"net/http"
 	"path/filepath"
 	"strings"
@@ -15,7 +17,75 @@ import (
 	"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
 )
 
-func (a *api) postHandler() http.Handler {
+//go:embed tpl
+var tplFS embed.FS
+
+func mustParseTpl(name string) *template.Template {
+
+	mustRead := func(fileName string) string {
+		path := filepath.Join("tpl", fileName)
+
+		b, err := fs.ReadFile(tplFS, path)
+		if err != nil {
+			panic(fmt.Errorf("reading file %q from tplFS: %w", path, err))
+		}
+
+		return string(b)
+	}
+
+	tpl := template.Must(template.New("").Parse(mustRead(name)))
+	tpl = template.Must(tpl.New("base.html").Parse(mustRead("base.html")))
+
+	return tpl
+}
+
+func (a *api) renderIndexHandler() http.Handler {
+
+	tpl := mustParseTpl("index.html")
+	const pageCount = 20
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		if path := r.URL.Path; !strings.HasSuffix(path, "/") && filepath.Base(path) != "index.html" {
+			http.Error(rw, "Page not found", 404)
+			return
+		}
+
+		page, err := apiutil.StrToInt(r.FormValue("p"), 0)
+		if err != nil {
+			apiutil.BadRequest(
+				rw, r, fmt.Errorf("invalid page number: %w", err),
+			)
+			return
+		}
+
+		posts, _, err := a.params.PostStore.Get(page, pageCount)
+		if err != nil {
+			apiutil.InternalServerError(
+				rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err),
+			)
+			return
+		}
+
+		tplData := struct {
+			Posts []post.StoredPost
+		}{
+			Posts: posts,
+		}
+
+		if err := tpl.Execute(rw, tplData); err != nil {
+			apiutil.InternalServerError(
+				rw, r, fmt.Errorf("rendering index: %w", err),
+			)
+			return
+		}
+	})
+}
+
+func (a *api) renderPostHandler() http.Handler {
+
+	tpl := mustParseTpl("post.html")
+
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 
 		id := strings.TrimSuffix(filepath.Base(r.URL.Path), ".html")
@@ -81,7 +151,7 @@ func (a *api) postHandler() http.Handler {
 			}
 		}
 
-		if err := tpls.ExecuteTemplate(rw, "post.html", tplData); err != nil {
+		if err := tpl.Execute(rw, tplData); err != nil {
 			apiutil.InternalServerError(
 				rw, r, fmt.Errorf("rendering post with id %q: %w", id, err),
 			)
diff --git a/srv/src/api/tpl/index.html b/srv/src/api/tpl/index.html
new file mode 100644
index 0000000..240df92
--- /dev/null
+++ b/srv/src/api/tpl/index.html
@@ -0,0 +1,20 @@
+{{ define "body" }}
+<ul id="posts-list">
+
+  {{ range .Posts }}
+  <li>
+    <h2>
+      <a href="{{ .HTTPPath }}">{{ .Title }}</a>
+    </h2>
+    <span>{{ .PublishedAt.Format "2006-01-02" }}</span>
+    {{ if not .LastUpdatedAt.IsZero }}
+    <span>(Updated {{ .LastUpdatedAt.Format "2006-01-02" }})</span>
+    {{ end }}
+    <p>{{ .Description }}</p>
+  </li>
+  {{ end }}
+
+</ul>
+{{ end }}
+
+{{ template "base.html" . }}
diff --git a/srv/src/post/post.go b/srv/src/post/post.go
index 5835995..30ded15 100644
--- a/srv/src/post/post.go
+++ b/srv/src/post/post.go
@@ -58,8 +58,9 @@ type Store interface {
 	// overwrites a previous Post with the same ID, if there was one.
 	Set(post Post, now time.Time) error
 
-	// Get returns count StoredPosts, sorted time descending, offset by the given page
-	// number. The returned boolean indicates if there are more pages or not.
+	// Get returns count StoredPosts, sorted time descending, offset by the
+	// given page number. The returned boolean indicates if there are more pages
+	// or not.
 	Get(page, count int) ([]StoredPost, bool, error)
 
 	// GetByID will return the StoredPost with the given ID, or ErrPostNotFound.