From 44e2954b208731109c5d7300f30a628a28d5b0a3 Mon Sep 17 00:00:00 2001
From: ligi <ligi@ligi.de>
Date: Mon, 29 May 2017 13:56:19 +0200
Subject: [PATCH] Add support for ethereum (ERC-67) URIs

see https://github.com/ethereum/EIPs/issues/67
---
 .../k9/message/html/EthereumUriParser.java    | 32 +++++++
 .../fsck/k9/message/html/UriLinkifier.java    |  1 +
 .../message/html/EthereumUriParserTest.java   | 83 +++++++++++++++++++
 3 files changed, 116 insertions(+)
 create mode 100644 k9mail/src/main/java/com/fsck/k9/message/html/EthereumUriParser.java
 create mode 100644 k9mail/src/test/java/com/fsck/k9/message/html/EthereumUriParserTest.java

diff --git a/k9mail/src/main/java/com/fsck/k9/message/html/EthereumUriParser.java b/k9mail/src/main/java/com/fsck/k9/message/html/EthereumUriParser.java
new file mode 100644
index 000000000..04c390ea7
--- /dev/null
+++ b/k9mail/src/main/java/com/fsck/k9/message/html/EthereumUriParser.java
@@ -0,0 +1,32 @@
+package com.fsck.k9.message.html;
+
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Parses ERC-67 URIs
+ * https://github.com/ethereum/EIPs/issues/67
+ */
+class EthereumUriParser implements UriParser {
+    private static final Pattern ETHEREUM_URI_PATTERN =
+            Pattern.compile("ethereum:0x[0-9a-fA-F]*(\\?[a-zA-Z0-9$\\-_.+!*'(),%:@&=]*)?");
+
+    @Override
+    public int linkifyUri(String text, int startPos, StringBuffer outputBuffer) {
+        Matcher matcher = ETHEREUM_URI_PATTERN.matcher(text);
+
+        if (!matcher.find(startPos) || matcher.start() != startPos) {
+            return startPos;
+        }
+
+        String ethereumURI = matcher.group();
+        outputBuffer.append("<a href=\"")
+                .append(ethereumURI)
+                .append("\">")
+                .append(ethereumURI)
+                .append("</a>");
+
+        return matcher.end();
+    }
+}
diff --git a/k9mail/src/main/java/com/fsck/k9/message/html/UriLinkifier.java b/k9mail/src/main/java/com/fsck/k9/message/html/UriLinkifier.java
index 01ee239e6..815acc5ce 100644
--- a/k9mail/src/main/java/com/fsck/k9/message/html/UriLinkifier.java
+++ b/k9mail/src/main/java/com/fsck/k9/message/html/UriLinkifier.java
@@ -18,6 +18,7 @@ public class UriLinkifier {
 
     static {
         SUPPORTED_URIS = new HashMap<>();
+        SUPPORTED_URIS.put("ethereum:", new EthereumUriParser());
         SUPPORTED_URIS.put("bitcoin:", new BitcoinUriParser());
         UriParser httpParser = new HttpUriParser();
         SUPPORTED_URIS.put("http:", httpParser);
diff --git a/k9mail/src/test/java/com/fsck/k9/message/html/EthereumUriParserTest.java b/k9mail/src/test/java/com/fsck/k9/message/html/EthereumUriParserTest.java
new file mode 100644
index 000000000..71460ea6c
--- /dev/null
+++ b/k9mail/src/test/java/com/fsck/k9/message/html/EthereumUriParserTest.java
@@ -0,0 +1,83 @@
+package com.fsck.k9.message.html;
+
+
+import org.junit.Test;
+import static com.fsck.k9.message.html.UriParserTestHelper.assertLinkOnly;
+import static org.junit.Assert.assertEquals;
+
+
+public class EthereumUriParserTest {
+    EthereumUriParser parser = new EthereumUriParser();
+    StringBuffer outputBuffer = new StringBuffer();
+
+
+    @Test
+    public void basicEthereumUri() throws Exception {
+        assertLinkify("ethereum:0xfdf1210fc262c73d0436236a0e07be419babbbc4");
+    }
+
+    @Test
+    public void ethereumUriWithValue() throws Exception {
+        assertLinkify("ethereum:0xfdf1210fc262c73d0436236a0e07be419babbbc4?value=42");
+    }
+
+    @Test
+    public void ethereumUriWithQueryParameters() throws Exception {
+        assertLinkify("ethereum:0xfdf1210fc262c73d0436236a0e07be419babbbc4?value=42" +
+                "&gas=100000&bytecode=0xa9059cbb0000000000000000000000000000000dead");
+    }
+
+    @Test
+    public void uriInMiddleOfInput() throws Exception {
+        String prefix = "prefix ";
+        String uri = "ethereum:0xfdf1210fc262c73d0436236a0e07be419babbbc4?value=42";
+        String text = prefix + uri;
+
+        parser.linkifyUri(text, prefix.length(), outputBuffer);
+
+        assertLinkOnly(uri, outputBuffer);
+    }
+
+    @Test
+    public void invalidScheme() throws Exception {
+        assertNotLinkify("ethereMU:0xfdf1210fc262c73d0436236a0e07be419babbbc4");
+    }
+
+    @Test
+    public void invalidAddress() throws Exception {
+        assertNotLinkify("ethereum:[invalid]");
+    }
+
+    @Test
+    public void invalidEthereumUri_shouldReturnStartingPosition() throws Exception {
+        String uri = "ethereum:[invalid]";
+
+        int newPos = linkify(uri);
+
+        assertEquals(0, newPos);
+    }
+
+    @Test
+    public void invalidEthereumUri_shouldNotWriteToOutputBuffer() throws Exception {
+        String uri = "ethereum:[invalid]";
+
+        linkify(uri);
+
+        assertEquals(0, outputBuffer.length());
+    }
+
+
+    int linkify(String uri) {
+        return parser.linkifyUri(uri, 0, outputBuffer);
+    }
+
+    void assertLinkify(String uri) {
+        linkify(uri);
+        assertLinkOnly(uri, outputBuffer);
+    }
+
+    void assertNotLinkify(String text) {
+        int newPos = linkify(text);
+        assertEquals(0, newPos);
+    }
+}