1 files changed, 104 insertions, 0 deletions
diff --git a/libs/utils/WordPressUtils/src/main/java/org/wordpress/android/util/PhotonUtils.java b/libs/utils/WordPressUtils/src/main/java/org/wordpress/android/util/PhotonUtils.java
new file mode 100644
index 000000000..85a2adc93
--- /dev/null
+++ b/libs/utils/WordPressUtils/src/main/java/org/wordpress/android/util/PhotonUtils.java
@@ -0,0 +1,104 @@
+package org.wordpress.android.util;
+
+import android.text.TextUtils;
+
+/**
+ * routines related to the Photon API
+ * http://developer.wordpress.com/docs/photon/
+ */
+public class PhotonUtils {
+
+    private PhotonUtils() {
+        throw new AssertionError();
+    }
+
+    /*
+    * returns true if the passed url is an obvious "mshots" url
+    */
+    public static boolean isMshotsUrl(final String imageUrl) {
+        return (imageUrl != null && imageUrl.contains("/mshots/"));
+    }
+
+    /*
+     * returns a photon url for the passed image with the resize query set to the passed
+     * dimensions - note that the passed quality parameter will only affect JPEGs
+     */
+    public enum Quality {
+        HIGH,
+        MEDIUM,
+        LOW
+    }
+    public static String getPhotonImageUrl(String imageUrl, int width, int height) {
+        return getPhotonImageUrl(imageUrl, width, height, Quality.MEDIUM);
+    }
+    public static String getPhotonImageUrl(String imageUrl, int width, int height, Quality quality) {
+        if (TextUtils.isEmpty(imageUrl)) {
+            return "";
+        }
+
+        // make sure it's valid
+        int schemePos = imageUrl.indexOf("://");
+        if (schemePos == -1) {
+            return imageUrl;
+        }
+
+        // we have encountered some image urls that incorrectly have a # fragment part, which
+        // must be removed before removing the query string
+        int fragmentPos = imageUrl.indexOf("#");
+        if (fragmentPos > 0) {
+            imageUrl = imageUrl.substring(0, fragmentPos);
+        }
+
+        // remove existing query string since it may contain params that conflict with the passed ones
+        imageUrl = UrlUtils.removeQuery(imageUrl);
+
+        // if this is an "mshots" url, skip photon and return it with a query that sets the width/height
+        if (isMshotsUrl(imageUrl)) {
+            return imageUrl + "?w=" + width + "&h=" + height;
+        }
+
+        // strip=all removes EXIF and other non-visual data from JPEGs
+        String query = "?strip=all";
+
+        switch (quality) {
+            case HIGH:
+                query += "&quality=100";
+                break;
+            case LOW:
+                query += "&quality=35";
+                break;
+            default: // medium
+                query += "&quality=65";
+                break;
+        }
+
+        // if both width & height are passed use the "resize" param, use only "w" or "h" if just
+        // one of them is set
+        if (width > 0 && height > 0) {
+            query += "&resize=" + width + "," + height;
+        } else if (width > 0) {
+            query += "&w=" + width;
+        } else if (height > 0) {
+            query += "&h=" + height;
+        }
+
+        // return passed url+query if it's already a photon url
+        if (imageUrl.contains(".wp.com")) {
+            if (imageUrl.contains("i0.wp.com") || imageUrl.contains("i1.wp.com") || imageUrl.contains("i2.wp.com"))
+                return imageUrl + query;
+        }
+
+        // use wordpress.com as the host if image is on wordpress.com since it supports the same
+        // query params and, more importantly, can handle images in private blogs
+        if (imageUrl.contains("wordpress.com")) {
+            return imageUrl + query;
+        }
+
+        // must use https for https image urls
+        if (UrlUtils.isHttps(imageUrl)) {
+            return "https://i0.wp.com/" + imageUrl.substring(schemePos+3, imageUrl.length()) + query;
+        } else {
+            return "http://i0.wp.com/" + imageUrl.substring(schemePos+3, imageUrl.length()) + query;
+        }
+    }
+}