1 files changed, 95 insertions, 0 deletions
diff --git a/src/http/index.go b/src/http/index.go
new file mode 100644
index 0000000..a392361
--- /dev/null
+++ b/src/http/index.go
@@ -0,0 +1,95 @@
+package http
+
+import (
+	"fmt"
+	"net/http"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
+)
+
+func (a *api) renderIndexHandler() http.Handler {
+
+	legacyPostPathRegexp := regexp.MustCompile(
+		`^/[0-9]{4}/[0-9]{2}/[0-9]{2}/([^/.]+)\.html$`,
+	)
+
+	tpl := a.mustParseBasedTpl("index.html")
+	const pageCount = 10
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		path := r.URL.Path
+
+		if matches := legacyPostPathRegexp.FindStringSubmatch(path); len(matches) == 2 {
+			id := matches[1]
+			http.Redirect(rw, r, filepath.Join("/posts", id), http.StatusMovedPermanently)
+			return
+		}
+
+		if !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
+		}
+
+		tag := r.FormValue("tag")
+
+		var (
+			posts   []post.StoredPost
+			hasMore bool
+		)
+
+		if tag == "" {
+			posts, hasMore, err = a.params.PostStore.Get(page, pageCount)
+		} else {
+			posts, err = a.params.PostStore.GetByTag(tag)
+		}
+
+		if err != nil {
+			apiutil.InternalServerError(
+				rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err),
+			)
+			return
+		}
+
+		tags, err := a.params.PostStore.GetTags()
+		if err != nil {
+			apiutil.InternalServerError(
+				rw, r, fmt.Errorf("fething tags: %w", err),
+			)
+			return
+		}
+
+		tplPayload := struct {
+			Posts              []post.StoredPost
+			PrevPage, NextPage int
+			Tags               []string
+		}{
+			Posts:    posts,
+			PrevPage: -1,
+			NextPage: -1,
+			Tags:     tags,
+		}
+
+		if page > 0 {
+			tplPayload.PrevPage = page - 1
+		}
+
+		if hasMore {
+			tplPayload.NextPage = page + 1
+		}
+
+		executeTemplate(rw, r, tpl, tplPayload)
+	})
+}