Move template rendering logic into api package

srv/src/api/api.go

@@ -3,8 +3,10 @@ package api
 
 import (
 	"context"
+	"embed"
 	"errors"
 	"fmt"
+	"html/template"
 	"net"
 	"net/http"
 	"net/http/httputil"
@@ -20,6 +22,11 @@ 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 {
@@ -27,7 +34,6 @@ type Params struct {
 	PowManager pow.Manager
 
 	PostStore post.Store
-	PostHTTPRenderer post.Renderer
 
 	MailingList mailinglist.MailingList
 
@@ -190,7 +196,7 @@ func (a *api) handler() http.Handler {
 
 	mux.Handle("/api/", http.StripPrefix("/api", apiHandler))
 
-	mux.Handle("/posts/", a.postHandler())
+	mux.Handle("/v2/posts/", a.postHandler())
 
 	return mux
 }

srv/src/api/apiutil/apiutil.go

@@ -1,6 +1,6 @@
-// Package apiutils contains utilities which are useful for implementing api
+// Package apiutil contains utilities which are useful for implementing api
 // endpoints.
-package apiutils
+package apiutil
 
 import (
 	"context"

srv/src/api/chat.go

@@ -9,7 +9,7 @@ import (
 	"unicode"
 
 	"github.com/gorilla/websocket"
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
 	"github.com/mediocregopher/blog.mediocregopher.com/srv/chat"
 )
 
@@ -44,9 +44,9 @@ func newChatHandler(
 
 func (c *chatHandler) historyHandler() http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
-		limit, err := apiutils.StrToInt(r.PostFormValue("limit"), 0)
+		limit, err := apiutil.StrToInt(r.PostFormValue("limit"), 0)
 		if err != nil {
-			apiutils.BadRequest(rw, r, fmt.Errorf("invalid limit parameter: %w", err))
+			apiutil.BadRequest(rw, r, fmt.Errorf("invalid limit parameter: %w", err))
 			return
 		}
 
@@ -58,13 +58,13 @@ func (c *chatHandler) historyHandler() http.Handler {
 		})
 
 		if argErr := (chat.ErrInvalidArg{}); errors.As(err, &argErr) {
-			apiutils.BadRequest(rw, r, argErr.Err)
+			apiutil.BadRequest(rw, r, argErr.Err)
 			return
 		} else if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 		}
 
-		apiutils.JSONResult(rw, r, struct {
+		apiutil.JSONResult(rw, r, struct {
 			Cursor   string         `json:"cursor"`
 			Messages []chat.Message `json:"messages"`
 		}{
@@ -107,11 +107,11 @@ func (c *chatHandler) userIDHandler() http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 		userID, err := c.userID(r)
 		if err != nil {
-			apiutils.BadRequest(rw, r, err)
+			apiutil.BadRequest(rw, r, err)
 			return
 		}
 
-		apiutils.JSONResult(rw, r, struct {
+		apiutil.JSONResult(rw, r, struct {
 			UserID chat.UserID `json:"userID"`
 		}{
 			UserID: userID,
@@ -123,18 +123,18 @@ func (c *chatHandler) appendHandler() http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 		userID, err := c.userID(r)
 		if err != nil {
-			apiutils.BadRequest(rw, r, err)
+			apiutil.BadRequest(rw, r, err)
 			return
 		}
 
 		body := r.PostFormValue("body")
 
 		if l := len(body); l == 0 {
-			apiutils.BadRequest(rw, r, errors.New("body is required"))
+			apiutil.BadRequest(rw, r, errors.New("body is required"))
 			return
 
 		} else if l > 300 {
-			apiutils.BadRequest(rw, r, errors.New("body too long"))
+			apiutil.BadRequest(rw, r, errors.New("body too long"))
 			return
 		}
 
@@ -144,11 +144,11 @@ func (c *chatHandler) appendHandler() http.Handler {
 		})
 
 		if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 		}
 
-		apiutils.JSONResult(rw, r, struct {
+		apiutil.JSONResult(rw, r, struct {
 			MessageID string `json:"messageID"`
 		}{
 			MessageID: msg.ID,
@@ -164,7 +164,7 @@ func (c *chatHandler) listenHandler() http.Handler {
 
 		conn, err := c.wsUpgrader.Upgrade(rw, r, nil)
 		if err != nil {
-			apiutils.BadRequest(rw, r, err)
+			apiutil.BadRequest(rw, r, err)
 			return
 		}
 		defer conn.Close()
@@ -172,14 +172,14 @@ func (c *chatHandler) listenHandler() http.Handler {
 		it, err := c.room.Listen(ctx, sinceID)
 
 		if errors.As(err, new(chat.ErrInvalidArg)) {
-			apiutils.BadRequest(rw, r, err)
+			apiutil.BadRequest(rw, r, err)
 			return
 
 		} else if errors.Is(err, context.Canceled) {
 			return
 
 		} else if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 		}
 
@@ -192,7 +192,7 @@ func (c *chatHandler) listenHandler() http.Handler {
 				return
 
 			} else if err != nil {
-				apiutils.InternalServerError(rw, r, err)
+				apiutil.InternalServerError(rw, r, err)
 				return
 			}
 
@@ -203,7 +203,7 @@ func (c *chatHandler) listenHandler() http.Handler {
 			})
 
 			if err != nil {
-				apiutils.GetRequestLogger(r).Error(ctx, "couldn't write message", err)
+				apiutil.GetRequestLogger(r).Error(ctx, "couldn't write message", err)
 				return
 			}
 		}

srv/src/api/csrf.go

@@ -4,7 +4,7 @@ import (
 	"errors"
 	"net/http"
 
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
 )
 
 const (
@@ -15,16 +15,16 @@ const (
 func setCSRFMiddleware(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 
-		csrfTok, err := apiutils.GetCookie(r, csrfTokenCookieName, "")
+		csrfTok, err := apiutil.GetCookie(r, csrfTokenCookieName, "")
 
 		if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 
 		} else if csrfTok == "" {
 			http.SetCookie(rw, &http.Cookie{
 				Name:   csrfTokenCookieName,
-				Value:  apiutils.RandStr(32),
+				Value:  apiutil.RandStr(32),
 				Secure: true,
 			})
 		}
@@ -36,10 +36,10 @@ func setCSRFMiddleware(h http.Handler) http.Handler {
 func checkCSRFMiddleware(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 
-		csrfTok, err := apiutils.GetCookie(r, csrfTokenCookieName, "")
+		csrfTok, err := apiutil.GetCookie(r, csrfTokenCookieName, "")
 
 		if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 		}
 
@@ -49,7 +49,7 @@ func checkCSRFMiddleware(h http.Handler) http.Handler {
 		}
 
 		if csrfTok == "" || givenCSRFTok != csrfTok {
-			apiutils.BadRequest(rw, r, errors.New("invalid CSRF token"))
+			apiutil.BadRequest(rw, r, errors.New("invalid CSRF token"))
 			return
 		}
 

srv/src/api/mailinglist.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"strings"
 
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
 	"github.com/mediocregopher/blog.mediocregopher.com/srv/mailinglist"
 )
 
@@ -16,7 +16,7 @@ func (a *api) mailingListSubscribeHandler() http.Handler {
 			parts[0] == "" ||
 			parts[1] == "" ||
 			len(email) >= 512 {
-			apiutils.BadRequest(rw, r, errors.New("invalid email"))
+			apiutil.BadRequest(rw, r, errors.New("invalid email"))
 			return
 		}
 
@@ -26,11 +26,11 @@ func (a *api) mailingListSubscribeHandler() http.Handler {
 			// just eat the error, make it look to the user like the
 			// verification email was sent.
 		} else if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 		}
 
-		apiutils.JSONResult(rw, r, struct{}{})
+		apiutil.JSONResult(rw, r, struct{}{})
 	})
 }
 
@@ -40,25 +40,25 @@ func (a *api) mailingListFinalizeHandler() http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 		subToken := r.PostFormValue("subToken")
 		if l := len(subToken); l == 0 || l > 128 {
-			apiutils.BadRequest(rw, r, errInvalidSubToken)
+			apiutil.BadRequest(rw, r, errInvalidSubToken)
 			return
 		}
 
 		err := a.params.MailingList.FinalizeSubscription(subToken)
 
 		if errors.Is(err, mailinglist.ErrNotFound) {
-			apiutils.BadRequest(rw, r, errInvalidSubToken)
+			apiutil.BadRequest(rw, r, errInvalidSubToken)
 			return
 
 		} else if errors.Is(err, mailinglist.ErrAlreadyVerified) {
 			// no problem
 
 		} else if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 		}
 
-		apiutils.JSONResult(rw, r, struct{}{})
+		apiutil.JSONResult(rw, r, struct{}{})
 	})
 }
 
@@ -68,21 +68,21 @@ func (a *api) mailingListUnsubscribeHandler() http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 		unsubToken := r.PostFormValue("unsubToken")
 		if l := len(unsubToken); l == 0 || l > 128 {
-			apiutils.BadRequest(rw, r, errInvalidUnsubToken)
+			apiutil.BadRequest(rw, r, errInvalidUnsubToken)
 			return
 		}
 
 		err := a.params.MailingList.Unsubscribe(unsubToken)
 
 		if errors.Is(err, mailinglist.ErrNotFound) {
-			apiutils.BadRequest(rw, r, errInvalidUnsubToken)
+			apiutil.BadRequest(rw, r, errInvalidUnsubToken)
 			return
 
 		} else if err != nil {
-			apiutils.InternalServerError(rw, r, err)
+			apiutil.InternalServerError(rw, r, err)
 			return
 		}
 
-		apiutils.JSONResult(rw, r, struct{}{})
+		apiutil.JSONResult(rw, r, struct{}{})
 	})
 }

srv/src/api/middleware.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
 	"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
 	"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
 )
@@ -61,7 +61,7 @@ func (lrw *logResponseWriter) WriteHeader(statusCode int) {
 func logMiddleware(logger *mlog.Logger, h http.Handler) http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 
-		r = apiutils.SetRequestLogger(r, logger)
+		r = apiutil.SetRequestLogger(r, logger)
 
 		lrw := newLogResponseWriter(rw)
 
@@ -90,7 +90,7 @@ func postOnlyMiddleware(h http.Handler) http.Handler {
 			return
 		}
 
-		apiutils.GetRequestLogger(r).WarnString(r.Context(), "method not allowed")
+		apiutil.GetRequestLogger(r).WarnString(r.Context(), "method not allowed")
 		rw.WriteHeader(405)
 	})
 }

srv/src/api/posts.go

@@ -3,11 +3,15 @@ package api
 import (
 	"errors"
 	"fmt"
+	"html/template"
 	"net/http"
 	"path/filepath"
 	"strings"
 
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/gomarkdown/markdown"
+	"github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
 	"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
 )
 
@@ -22,22 +26,63 @@ func (a *api) postHandler() http.Handler {
 			http.Error(rw, "Post not found", 404)
 			return
 		} else if err != nil {
-			apiutils.InternalServerError(
+			apiutil.InternalServerError(
 				rw, r, fmt.Errorf("fetching post with id %q: %w", id, err),
 			)
 			return
 		}
 
-		renderablePost, err := post.NewRenderablePost(a.params.PostStore, storedPost)
+		parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
+		parser := parser.NewWithExtensions(parserExt)
+
+		htmlFlags := html.CommonFlags | html.HrefTargetBlank
+		htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
+
+		renderedBody := markdown.ToHTML([]byte(storedPost.Body), parser, htmlRenderer)
+
+		tplData := struct {
+			post.StoredPost
+			SeriesPrevious, SeriesNext *post.StoredPost
+			Body                       template.HTML
+		}{
+			StoredPost: storedPost,
+			Body:       template.HTML(renderedBody),
+		}
+
+		if series := storedPost.Series; series != "" {
+
+			seriesPosts, err := a.params.PostStore.GetBySeries(series)
 			if err != nil {
-			apiutils.InternalServerError(
+				apiutil.InternalServerError(
-				rw, r, fmt.Errorf("constructing renderable post with id %q: %w", id, err),
+					rw, r,
+					fmt.Errorf("fetching posts for series %q: %w", series, err),
 				)
 				return
 			}
 
-		if err := a.params.PostHTTPRenderer.Render(rw, renderablePost); err != nil {
+			var foundThis bool
-			apiutils.InternalServerError(
+
+			for i := range seriesPosts {
+
+				seriesPost := seriesPosts[i]
+
+				if seriesPost.ID == storedPost.ID {
+					foundThis = true
+					continue
+				}
+
+				if !foundThis {
+					tplData.SeriesPrevious = &seriesPost
+					continue
+				}
+
+				tplData.SeriesNext = &seriesPost
+				break
+			}
+		}
+
+		if err := tpls.ExecuteTemplate(rw, "post.html", tplData); err != nil {
+			apiutil.InternalServerError(
 				rw, r, fmt.Errorf("rendering post with id %q: %w", id, err),
 			)
 			return

srv/src/api/pow.go

@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"net/http"
 
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
 )
 
 func (a *api) newPowChallengeHandler() http.Handler {
@@ -14,7 +14,7 @@ func (a *api) newPowChallengeHandler() http.Handler {
 
 		challenge := a.params.PowManager.NewChallenge()
 
-		apiutils.JSONResult(rw, r, struct {
+		apiutil.JSONResult(rw, r, struct {
 			Seed   string `json:"seed"`
 			Target uint32 `json:"target"`
 		}{
@@ -30,21 +30,21 @@ func (a *api) requirePowMiddleware(h http.Handler) http.Handler {
 		seedHex := r.FormValue("powSeed")
 		seed, err := hex.DecodeString(seedHex)
 		if err != nil || len(seed) == 0 {
-			apiutils.BadRequest(rw, r, errors.New("invalid powSeed"))
+			apiutil.BadRequest(rw, r, errors.New("invalid powSeed"))
 			return
 		}
 
 		solutionHex := r.FormValue("powSolution")
 		solution, err := hex.DecodeString(solutionHex)
 		if err != nil || len(seed) == 0 {
-			apiutils.BadRequest(rw, r, errors.New("invalid powSolution"))
+			apiutil.BadRequest(rw, r, errors.New("invalid powSolution"))
 			return
 		}
 
 		err = a.params.PowManager.CheckSolution(seed, solution)
 
 		if err != nil {
-			apiutils.BadRequest(rw, r, fmt.Errorf("checking proof-of-work solution: %w", err))
+			apiutil.BadRequest(rw, r, fmt.Errorf("checking proof-of-work solution: %w", err))
 			return
 		}
 

srv/src/cmd/mediocre-blog/main.go

@@ -124,7 +124,6 @@ func main() {
 	apiParams.Logger = logger.WithNamespace("api")
 	apiParams.PowManager = powMgr
 	apiParams.PostStore = postStore
-	apiParams.PostHTTPRenderer = post.NewMarkdownToHTMLRenderer()
 	apiParams.MailingList = ml
 	apiParams.GlobalRoom = chatGlobalRoom
 	apiParams.UserIDCalculator = chatUserIDCalc

srv/src/post/renderer.go

@@ -1,96 +0,0 @@
-package post
-
-import (
-	_ "embed"
-	"fmt"
-	"html/template"
-	"io"
-
-	"github.com/gomarkdown/markdown"
-	"github.com/gomarkdown/markdown/html"
-	"github.com/gomarkdown/markdown/parser"
-	"github.com/mediocregopher/blog.mediocregopher.com/srv/tpl"
-)
-
-// RenderablePost is a Post wrapped with extra information necessary for
-// rendering.
-type RenderablePost struct {
-	StoredPost
-	SeriesPrevious, SeriesNext *StoredPost
-}
-
-// NewRenderablePost wraps an existing Post such that it can be rendered.
-func NewRenderablePost(store Store, post StoredPost) (RenderablePost, error) {
-
-	renderablePost := RenderablePost{
-		StoredPost: post,
-	}
-
-	if post.Series != "" {
-
-		seriesPosts, err := store.GetBySeries(post.Series)
-		if err != nil {
-			return RenderablePost{}, fmt.Errorf(
-				"fetching posts for series %q: %w",
-				post.Series, err,
-			)
-		}
-
-		var foundThis bool
-
-		for i := range seriesPosts {
-
-			seriesPost := seriesPosts[i]
-
-			if seriesPost.ID == post.ID {
-				foundThis = true
-				continue
-			}
-
-			if !foundThis {
-				renderablePost.SeriesPrevious = &seriesPost
-				continue
-			}
-
-			renderablePost.SeriesNext = &seriesPost
-			break
-		}
-	}
-
-	return renderablePost, nil
-}
-
-// Renderer takes a Post and renders it to some encoding.
-type Renderer interface {
-	Render(io.Writer, RenderablePost) error
-}
-
-func mdBodyToHTML(body []byte) []byte {
-	parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
-	parser := parser.NewWithExtensions(parserExt)
-
-	htmlFlags := html.CommonFlags | html.HrefTargetBlank
-	htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
-
-	return markdown.ToHTML(body, parser, htmlRenderer)
-}
-
-type mdHTMLRenderer struct{}
-
-// NewMarkdownToHTMLRenderer renders Posts from markdown to HTML.
-func NewMarkdownToHTMLRenderer() Renderer {
-	return mdHTMLRenderer{}
-}
-
-func (r mdHTMLRenderer) Render(into io.Writer, post RenderablePost) error {
-
-	data := struct {
-		RenderablePost
-		Body template.HTML
-	}{
-		RenderablePost: post,
-		Body:           template.HTML(mdBodyToHTML([]byte(post.Body))),
-	}
-
-	return tpl.HTML.ExecuteTemplate(into, "post.html", data)
-}

srv/src/post/renderer_test.go

@@ -1,92 +0,0 @@
-package post
-
-import (
-	"bytes"
-	"strconv"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestMarkdownBodyToHTML(t *testing.T) {
-
-	tests := []struct {
-		body string
-		exp  string
-	}{
-		{
-			body: `
-# Foo
-`,
-			exp: `<h1 id="foo">Foo</h1>`,
-		},
-		{
-			body: `
-this is a body
-
-this is another
-`,
-			exp: `
-<p>this is a body</p>
-
-<p>this is another</p>`,
-		},
-		{
-			body: `this is a [link](somewhere.html)`,
-			exp:  `<p>this is a <a href="somewhere.html" target="_blank">link</a></p>`,
-		},
-	}
-
-	for i, test := range tests {
-		t.Run(strconv.Itoa(i), func(t *testing.T) {
-
-			outB := mdBodyToHTML([]byte(test.body))
-			out := string(outB)
-
-			// just to make the tests nicer
-			out = strings.TrimSpace(out)
-			test.exp = strings.TrimSpace(test.exp)
-
-			assert.Equal(t, test.exp, out)
-		})
-	}
-}
-
-func TestMarkdownToHTMLRenderer(t *testing.T) {
-
-	r := NewMarkdownToHTMLRenderer()
-
-	post := RenderablePost{
-		StoredPost: StoredPost{
-			Post: Post{
-				ID:          "foo",
-				Title:       "Foo",
-				Description: "Bar.",
-				Body:        "This is the body.",
-				Series:      "baz",
-			},
-			PublishedAt: time.Now(),
-		},
-
-		SeriesPrevious: &StoredPost{
-			Post: Post{
-				ID:    "foo-prev",
-				Title: "Foo Prev",
-			},
-		},
-
-		SeriesNext: &StoredPost{
-			Post: Post{
-				ID:    "foo-next",
-				Title: "Foo Next",
-			},
-		},
-	}
-
-	buf := new(bytes.Buffer)
-	err := r.Render(buf, post)
-	assert.NoError(t, err)
-	t.Log(buf.String())
-}

srv/src/tpl/tpl.go

@@ -1,12 +0,0 @@
-// Package tpl contains template files which are used to render the blog.
-package tpl
-
-import (
-	"embed"
-	html_tpl "html/template"
-)
-
-//go:embed *
-var fs embed.FS
-
-var HTML = html_tpl.Must(html_tpl.ParseFS(fs, "html/*"))