1 files changed, 125 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/linked/LinkedResource.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/linked/LinkedResource.java
new file mode 100644
index 000000000..a3f288dbb
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/linked/LinkedResource.java
@@ -0,0 +1,125 @@
+package org.sufficientlysecure.keychain.pgp.linked;
+
+import android.content.Context;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.operations.results.LinkedVerifyResult;
+import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType;
+import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
+import org.sufficientlysecure.keychain.pgp.linked.resources.GenericHttpsResource;
+import org.sufficientlysecure.keychain.pgp.linked.resources.UnknownResource;
+import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
+import org.sufficientlysecure.keychain.util.Log;
+
+import java.net.URI;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public abstract class LinkedResource {
+
+    protected final URI mSubUri;
+    protected final Set<String> mFlags;
+    protected final HashMap<String,String> mParams;
+
+    static Pattern magicPattern =
+            Pattern.compile("\\[Verifying my PGP key: pgpid\\+cookie:([a-zA-Z0-9]+)#([a-zA-Z0-9]+)\\]");
+
+    protected LinkedResource(Set<String> flags, HashMap<String, String> params, URI uri) {
+        mFlags = flags;
+        mParams = params;
+        mSubUri = uri;
+    }
+
+    public Set<String> getFlags () {
+        return new HashSet<String>(mFlags);
+    }
+
+    public HashMap<String,String> getParams () {
+        return new HashMap<String,String>(mParams);
+    }
+
+    public URI getSubUri () {
+        return mSubUri;
+    }
+
+    public static String generate (Context context, byte[] fingerprint, String nonce) {
+
+        return "[Verifying my PGP key: pgpid+cookie:"
+                + KeyFormattingUtils.convertFingerprintToHex(fingerprint) + "#" + nonce + "]";
+
+    }
+
+    public LinkedVerifyResult verify(byte[] fingerprint, String nonce) {
+
+        OperationLog log = new OperationLog();
+        log.add(LogType.MSG_LV, 0);
+
+        // Try to fetch resource. Logs for itself
+        String res = fetchResource(log, 1);
+        if (res == null) {
+            // if this is null, an error was recorded in fetchResource above
+            return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
+        }
+
+        Log.d(Constants.TAG, "Resource data: '" + res + "'");
+
+        return verifyString(log, 1, res, nonce, fingerprint);
+
+    }
+
+    protected abstract String fetchResource (OperationLog log, int indent);
+
+    protected Matcher matchResource (OperationLog log, int indent, String res) {
+        return magicPattern.matcher(res);
+    }
+
+    protected LinkedVerifyResult verifyString (OperationLog log, int indent,
+                                               String res,
+                                               String nonce, byte[] fingerprint) {
+
+        log.add(LogType.MSG_LV_MATCH, indent);
+        Matcher match = matchResource(log, indent+1, res);
+        if (!match.find()) {
+            log.add(LogType.MSG_LV_MATCH_ERROR, 2);
+            return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
+        }
+
+        String candidateFp = match.group(1).toLowerCase();
+        String nonceCandidate = match.group(2).toLowerCase();
+
+        String fp = KeyFormattingUtils.convertFingerprintToHex(fingerprint);
+
+        if (!fp.equals(candidateFp)) {
+            log.add(LogType.MSG_LV_FP_ERROR, indent);
+            return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
+        }
+        log.add(LogType.MSG_LV_FP_OK, indent);
+
+        if (!nonce.equals(nonceCandidate)) {
+            log.add(LogType.MSG_LV_NONCE_ERROR, indent);
+            return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
+        }
+
+        log.add(LogType.MSG_LV_NONCE_OK, indent);
+        return new LinkedVerifyResult(LinkedVerifyResult.RESULT_OK, log);
+
+    }
+
+    public static LinkedResource findResourceType
+            (Set<String> flags, HashMap<String,String> params, URI uri) {
+
+        LinkedResource res;
+
+        res = GenericHttpsResource.create(flags, params, uri);
+        if (res != null) {
+            return res;
+        }
+
+        return new UnknownResource(flags, params, uri);
+
+    }
+
+}