From 5d063b0f8f7dee735cc5eeb8e21c37a9f453bacd Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@trenchant.org>
Date: Tue, 24 Apr 2018 21:12:44 -0700
Subject: wip img proxy

---
 models/item/item.go | 24 ++++++++++++++++++++++++
 web/web.go          | 26 ++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/models/item/item.go b/models/item/item.go
index 77ee02c..1e7e86a 100644
--- a/models/item/item.go
+++ b/models/item/item.go
@@ -3,11 +3,14 @@ package item
 import (
 	"adammathes.com/neko/models"
 	"adammathes.com/neko/vlog"
+	"encoding/base64"
 	"fmt"
+	"github.com/PuerkitoBio/goquery"
 	"github.com/advancedlogic/GoOse"
 	"github.com/microcosm-cc/bluemonday"
 	"github.com/russross/blackfriday"
 	"log"
+	"strings"
 )
 
 type Item struct {
@@ -176,6 +179,7 @@ func Filter(max_id int64, feed_id int64, category string, unread_only bool, star
 		// but still may need to adjust rules
 		i.Title = p.Sanitize(i.Title)
 		i.Description = p.Sanitize(i.Description)
+		i.Description = rewriteImages(i.Description)
 		i.Url = p.Sanitize(i.Url)
 		i.FeedTitle = p.Sanitize(i.FeedTitle)
 		i.FeedUrl = p.Sanitize(i.FeedUrl)
@@ -196,3 +200,23 @@ func (i *Item) CleanHeaderImage() {
 		i.HeaderImage = ""
 	}
 }
+
+func rewriteImages(s string) string {
+	doc, err := goquery.NewDocumentFromReader(strings.NewReader(s))
+	if err != nil {
+		panic("can not parse doc to rewrite")
+	}
+
+	doc.Find("img").Each(func(i int, img *goquery.Selection) {
+		if src, ok := img.Attr("src"); ok {
+			img.SetAttr("src", proxyURL(src))
+		}
+	})
+
+	output, _ := doc.Html()
+	return output
+}
+
+func proxyURL(url string) string {
+	return "/image/" + base64.URLEncoding.EncodeToString([]byte(url))
+}
diff --git a/web/web.go b/web/web.go
index 0dd0025..d871990 100644
--- a/web/web.go
+++ b/web/web.go
@@ -5,9 +5,11 @@ import (
 	"adammathes.com/neko/crawler"
 	"adammathes.com/neko/models/feed"
 	"adammathes.com/neko/models/item"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"golang.org/x/crypto/bcrypt"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"path"
@@ -128,6 +130,29 @@ func categoryHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func imageProxyHandler(w http.ResponseWriter, r *http.Request) {
+	// caching...???
+
+	imgURL := r.URL.String()
+	fmt.Printf("proxying: %s\n", imgURL)
+	decodedURL, err := base64.URLEncoding.DecodeString(imgURL)
+	fmt.Printf("decoded: %s\n", decodedURL)
+
+	resp, err := http.Get(string(decodedURL))
+	if err != nil {
+		http.Error(w, "sorry", 404)
+		return
+	}
+
+	bts, _ := ioutil.ReadAll(resp.Body)
+
+	etag := crypto.HashFromBytes(body)
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(bts)
+	return
+}
+
 var AuthCookie = "auth"
 var SecondsInAYear = 60 * 60 * 24 * 365
 
@@ -186,6 +211,7 @@ func Serve() {
 	http.HandleFunc("/item/", AuthWrap(itemHandler))
 	http.HandleFunc("/feed/", AuthWrap(feedHandler))
 	http.HandleFunc("/tag/", AuthWrap(categoryHandler))
+	http.Handle("/image/", http.StripPrefix("/image/", AuthWrap(imageProxyHandler)))
 
 	http.HandleFunc("/login/", loginHandler)
 	http.HandleFunc("/logout/", logoutHandler)
-- 
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