Simplify feed entries filtering

- Rename processor package to filter
- Remove boilerplate code

4 files changed, 45 insertions, 86 deletions

diff --git a/reader/feed/handler.go b/reader/feed/handler.go
index 5c13dd4..d48a80a 100644
--- a/reader/feed/handler.go
+++ b/reader/feed/handler.go
@@ -14,9 +14,9 @@ import (
 	"miniflux.app/logger"
 	"miniflux.app/model"
 	"miniflux.app/reader/browser"
+	"miniflux.app/reader/filter"
 	"miniflux.app/reader/icon"
 	"miniflux.app/reader/parser"
-	"miniflux.app/reader/processor"
 	"miniflux.app/storage"
 	"miniflux.app/timer"
 )
@@ -63,9 +63,7 @@ func (h *Handler) CreateFeed(userID, categoryID int64, url string, crawler bool,
 	subscription.WithClientResponse(response)
 	subscription.CheckedNow()
 
-	feedProcessor := processor.NewFeedProcessor(userID, h.store, subscription)
-	feedProcessor.WithCrawler(crawler)
-	feedProcessor.Process()
+	filter.Apply(h.store, subscription)
 
 	if storeErr := h.store.CreateFeed(subscription); storeErr != nil {
 		return nil, storeErr
@@ -108,22 +106,18 @@ func (h *Handler) RefreshFeed(userID, feedID int64) error {
 	if response.IsModified(originalFeed.EtagHeader, originalFeed.LastModifiedHeader) {
 		logger.Debug("[Handler:RefreshFeed] Feed #%d has been modified", feedID)
 
-		subscription, parseErr := parser.ParseFeed(response.String())
+		updatedFeed, parseErr := parser.ParseFeed(response.String())
 		if parseErr != nil {
 			originalFeed.WithError(parseErr.Localize(printer))
 			h.store.UpdateFeed(originalFeed)
 			return parseErr
 		}
 
-		feedProcessor := processor.NewFeedProcessor(userID, h.store, subscription)
-		feedProcessor.WithScraperRules(originalFeed.ScraperRules)
-		feedProcessor.WithUserAgent(originalFeed.UserAgent)
-		feedProcessor.WithRewriteRules(originalFeed.RewriteRules)
-		feedProcessor.WithCrawler(originalFeed.Crawler)
-		feedProcessor.Process()
+		originalFeed.Entries = updatedFeed.Entries
+		filter.Apply(h.store, originalFeed)
 
-		// Note: We don't update existing entries when the crawler is enabled (we crawl only inexisting entries).
-		if storeErr := h.store.UpdateEntries(originalFeed.UserID, originalFeed.ID, subscription.Entries, !originalFeed.Crawler); storeErr != nil {
+		// We don't update existing entries when the crawler is enabled (we crawl only inexisting entries).
+		if storeErr := h.store.UpdateEntries(originalFeed.UserID, originalFeed.ID, originalFeed.Entries, !originalFeed.Crawler); storeErr != nil {
 			return storeErr
 		}
 
diff --git a/reader/processor/doc.go b/reader/filter/doc.go
index f0e7fd4..92c18c0 100644
--- a/reader/processor/doc.go
+++ b/reader/filter/doc.go
@@ -4,7 +4,7 @@
 
 /*
 
-Package processor handles the logic to manipulate feed contents.
+Package filter applies a set of filters to feed entries.
 
 */
-package processor // import "miniflux.app/reader/processor"
+package filter // import "miniflux.app/reader/filter"
diff --git a/reader/filter/filter.go b/reader/filter/filter.go
new file mode 100644
index 0000000..a0b9429
--- /dev/null
+++ b/reader/filter/filter.go
@@ -0,0 +1,36 @@
+// Copyright 2018 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package filter
+
+import (
+	"miniflux.app/logger"
+	"miniflux.app/model"
+	"miniflux.app/reader/rewrite"
+	"miniflux.app/reader/sanitizer"
+	"miniflux.app/reader/scraper"
+	"miniflux.app/storage"
+)
+
+// Apply executes all entry filters.
+func Apply(store *storage.Storage, feed *model.Feed) {
+	for _, entry := range feed.Entries {
+		if feed.Crawler {
+			if !store.EntryURLExists(feed.UserID, entry.URL) {
+				content, err := scraper.Fetch(entry.URL, feed.ScraperRules, feed.UserAgent)
+				if err != nil {
+					logger.Error("Unable to crawl this entry: %q => %v", entry.URL, err)
+				} else {
+					// We replace the entry content only if the scraper doesn't return any error.
+					entry.Content = content
+				}
+			}
+		}
+
+		entry.Content = rewrite.Rewriter(entry.URL, entry.Content, feed.RewriteRules)
+
+		// The sanitizer should always run at the end of the process to make sure unsafe HTML is filtered.
+		entry.Content = sanitizer.Sanitize(entry.URL, entry.Content)
+	}
+}
diff --git a/reader/processor/processor.go b/reader/processor/processor.go
deleted file mode 100644
index f57e6cd..0000000
--- a/reader/processor/processor.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// Copyright 2017 Frédéric Guillot. All rights reserved.
-// Use of this source code is governed by the Apache 2.0
-// license that can be found in the LICENSE file.
-
-package processor // import "miniflux.app/reader/processor"
-
-import (
-	"miniflux.app/logger"
-	"miniflux.app/model"
-	"miniflux.app/reader/rewrite"
-	"miniflux.app/reader/sanitizer"
-	"miniflux.app/reader/scraper"
-	"miniflux.app/storage"
-)
-
-// FeedProcessor handles the processing of feed contents.
-type FeedProcessor struct {
-	userID       int64
-	store        *storage.Storage
-	feed         *model.Feed
-	scraperRules string
-	rewriteRules string
-	crawler      bool
-	userAgent    string
-}
-
-// WithCrawler enables the crawler.
-func (f *FeedProcessor) WithCrawler(value bool) {
-	f.crawler = value
-}
-
-// WithScraperRules adds scraper rules to the processing.
-func (f *FeedProcessor) WithScraperRules(rules string) {
-	f.scraperRules = rules
-}
-
-// WithUserAgent sets the User-Agent header for fetching article content.
-func (f *FeedProcessor) WithUserAgent(userAgent string) {
-	f.userAgent = userAgent
-}
-
-// WithRewriteRules adds rewrite rules to the processing.
-func (f *FeedProcessor) WithRewriteRules(rules string) {
-	f.rewriteRules = rules
-}
-
-// Process applies rewrite and scraper rules.
-func (f *FeedProcessor) Process() {
-	for _, entry := range f.feed.Entries {
-		if f.crawler {
-			if f.store.EntryURLExists(f.userID, entry.URL) {
-				logger.Debug(`[FeedProcessor] Do not crawl existing entry URL: "%s"`, entry.URL)
-			} else {
-				content, err := scraper.Fetch(entry.URL, f.scraperRules, f.userAgent)
-				if err != nil {
-					logger.Error("[FeedProcessor] %v", err)
-				} else {
-					entry.Content = content
-				}
-			}
-		}
-
-		entry.Content = rewrite.Rewriter(entry.URL, entry.Content, f.rewriteRules)
-		entry.Content = sanitizer.Sanitize(entry.URL, entry.Content)
-	}
-}
-
-// NewFeedProcessor returns a new FeedProcessor.
-func NewFeedProcessor(userID int64, store *storage.Storage, feed *model.Feed) *FeedProcessor {
-	return &FeedProcessor{userID: userID, store: store, feed: feed, crawler: false}
-}