feat(reader): add content rewrite rule to strip query params from blurry placeholder images

internal/reader/rewrite/content_rewrite.go

@@ -94,6 +94,8 @@ func (rule rule) applyRule(entryURL string, entry *model.Entry) {
 		entry.Title = titlelize(entry.Title)
 	case "fix_ghost_cards":
 		entry.Content = fixGhostCards(entry.Content)
+	case "strip_image_query_params":
+		entry.Content = stripImageQueryParams(entry.Content)
 	}
 }
 

internal/reader/rewrite/content_rewrite_functions.go

@@ -10,6 +10,7 @@ import (
 	"log/slog"
 	"net/url"
 	"regexp"
+	"strconv"
 	"strings"
 	"unicode"
 
@@ -547,3 +548,50 @@ func fixGhostCards(entryContent string) string {
 	output, _ := doc.FindMatcher(goquery.Single("body")).Html()
 	return strings.TrimSpace(output)
 }
+
+func stripImageQueryParams(entryContent string) string {
+	doc, err := goquery.NewDocumentFromReader(strings.NewReader(entryContent))
+	if err != nil {
+		return entryContent
+	}
+
+	changed := false
+
+	doc.Find("img").Each(func(i int, img *goquery.Selection) {
+		srcAttr, exists := img.Attr("src")
+		if !exists {
+			return
+		}
+
+		parsedURL, err := url.Parse(srcAttr)
+		if err != nil {
+			return
+		}
+
+		// Only strip query parameters if this is a blurry placeholder image
+		if parsedURL.RawQuery != "" {
+			queryParams, err := url.ParseQuery(parsedURL.RawQuery)
+			if err != nil {
+				return
+			}
+
+			// Check if there's a blur parameter with a non-zero value
+			blurValues, hasBlur := queryParams["blur"]
+			if hasBlur && len(blurValues) > 0 {
+				blurValue, err := strconv.Atoi(blurValues[0])
+				if err == nil && blurValue > 0 {
+					parsedURL.RawQuery = ""
+					img.SetAttr("src", parsedURL.String())
+					changed = true
+				}
+			}
+		}
+	})
+
+	if changed {
+		output, _ := doc.FindMatcher(goquery.Single("body")).Html()
+		return output
+	}
+
+	return entryContent
+}

internal/reader/rewrite/content_rewrite_test.go

@@ -1248,3 +1248,158 @@ func TestFixGhostCardMultipleSplit(t *testing.T) {
 		t.Errorf(`Not expected output: got "%+v" instead of "%+v"`, testEntry, controlEntry)
 	}
 }
+
+func TestStripImageQueryParams(t *testing.T) {
+	testEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `News Article Title`,
+		Content: `
+		<article>
+			<p>Article content with images having query parameters:</p>
+			<img src="https://example.org/images/image1.jpg?width=200&height=113&q=80&blur=90" alt="Image with params">
+			<img src="https://example.org/images/image2.jpg?width=800&height=600&q=85" alt="Another image with params">
+			
+			<p>More images with various query parameters:</p>
+			<img src="https://example.org/image123.jpg?blur=50&size=small&format=webp" alt="Complex query params">
+			<img src="https://example.org/image123.jpg?size=large&quality=95&cache=123" alt="Different params">
+			
+			<p>Image without query parameters:</p>
+			<img src="https://example.org/single-image.jpg" alt="Clean image">
+			
+			<p>Images with various other params:</p>
+			<img src="https://example.org/normal1.jpg?width=300&format=jpg" alt="Normal 1">
+			<img src="https://example.org/normal1.jpg?width=600&quality=high" alt="Normal 2">
+		</article>`,
+	}
+
+	controlEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `News Article Title`,
+		Content: `<article>
+			<p>Article content with images having query parameters:</p>
+			<img src="https://example.org/images/image1.jpg" alt="Image with params"/>
+			<img src="https://example.org/images/image2.jpg?width=800&amp;height=600&amp;q=85" alt="Another image with params"/>
+			
+			<p>More images with various query parameters:</p>
+			<img src="https://example.org/image123.jpg" alt="Complex query params"/>
+			<img src="https://example.org/image123.jpg?size=large&amp;quality=95&amp;cache=123" alt="Different params"/>
+			
+			<p>Image without query parameters:</p>
+			<img src="https://example.org/single-image.jpg" alt="Clean image"/>
+			
+			<p>Images with various other params:</p>
+			<img src="https://example.org/normal1.jpg?width=300&amp;format=jpg" alt="Normal 1"/>
+			<img src="https://example.org/normal1.jpg?width=600&amp;quality=high" alt="Normal 2"/>
+		</article>`,
+	}
+	ApplyContentRewriteRules(testEntry, `strip_image_query_params`)
+
+	if !reflect.DeepEqual(testEntry, controlEntry) {
+		t.Errorf(`Not expected output: got "%+v" instead of "%+v"`, testEntry, controlEntry)
+	}
+}
+
+func TestStripImageQueryParamsNoChanges(t *testing.T) {
+	testEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `Article Without Images`,
+		Content: `<p>No images here:</p>
+		<div>Just some text content</div>
+		<a href="https://example.org">A link</a>`,
+	}
+
+	controlEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `Article Without Images`,
+		Content: `<p>No images here:</p>
+		<div>Just some text content</div>
+		<a href="https://example.org">A link</a>`,
+	}
+	ApplyContentRewriteRules(testEntry, `strip_image_query_params`)
+
+	if !reflect.DeepEqual(testEntry, controlEntry) {
+		t.Errorf(`Not expected output: got "%+v" instead of "%+v"`, testEntry, controlEntry)
+	}
+}
+
+func TestStripImageQueryParamsEdgeCases(t *testing.T) {
+	testEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `Edge Cases`,
+		Content: `
+		<p>Edge cases for image query parameter stripping:</p>
+		
+		<!-- Various query parameters -->
+		<img src="https://example.org/image1.jpg?blur=80&width=300" alt="Multiple params">
+		
+		<!-- Complex query parameters -->
+		<img src="https://example.org/image2.jpg?BLUR=60&format=webp&cache=123" alt="Complex params">
+		<img src="https://example.org/image3.jpg?quality=high&version=2" alt="Other params">
+		
+		<!-- Query params in middle of string -->
+		<img src="https://example.org/image4.jpg?size=large&blur=30&format=webp&quality=90" alt="Middle params">
+		
+		<!-- Image without query params -->
+		<img src="https://example.org/clean.jpg" alt="Clean image">
+		`,
+	}
+
+	controlEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `Edge Cases`,
+		Content: `<p>Edge cases for image query parameter stripping:</p>
+		
+		<!-- Various query parameters -->
+		<img src="https://example.org/image1.jpg" alt="Multiple params"/>
+		
+		<!-- Complex query parameters -->
+		<img src="https://example.org/image2.jpg?BLUR=60&amp;format=webp&amp;cache=123" alt="Complex params"/>
+		<img src="https://example.org/image3.jpg?quality=high&amp;version=2" alt="Other params"/>
+		
+		<!-- Query params in middle of string -->
+		<img src="https://example.org/image4.jpg" alt="Middle params"/>
+		
+		<!-- Image without query params -->
+		<img src="https://example.org/clean.jpg" alt="Clean image"/>
+		`,
+	}
+	ApplyContentRewriteRules(testEntry, `strip_image_query_params`)
+
+	if !reflect.DeepEqual(testEntry, controlEntry) {
+		t.Errorf(`Not expected output: got "%+v" instead of "%+v"`, testEntry, controlEntry)
+	}
+}
+
+func TestStripImageQueryParamsSimple(t *testing.T) {
+	testEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `Simple Test`,
+		Content: `
+		<p>Testing query parameter stripping:</p>
+		
+		<!-- Images with various query parameters -->
+		<img src="https://example.org/test1.jpg?blur=0&width=300" alt="With blur zero">
+		<img src="https://example.org/test2.jpg?blur=50&width=300&format=webp" alt="With blur fifty">
+		<img src="https://example.org/test3.jpg?width=800&quality=high" alt="No blur param">
+		<img src="https://example.org/test4.jpg" alt="No params at all">
+		`,
+	}
+
+	controlEntry := &model.Entry{
+		URL:   "https://example.org/article",
+		Title: `Simple Test`,
+		Content: `<p>Testing query parameter stripping:</p>
+		
+		<!-- Images with various query parameters -->
+		<img src="https://example.org/test1.jpg?blur=0&amp;width=300" alt="With blur zero"/>
+		<img src="https://example.org/test2.jpg" alt="With blur fifty"/>
+		<img src="https://example.org/test3.jpg?width=800&amp;quality=high" alt="No blur param"/>
+		<img src="https://example.org/test4.jpg" alt="No params at all"/>
+		`,
+	}
+	ApplyContentRewriteRules(testEntry, `strip_image_query_params`)
+
+	if !reflect.DeepEqual(testEntry, controlEntry) {
+		t.Errorf(`Not expected output: got "%+v" instead of "%+v"`, testEntry, controlEntry)
+	}
+}