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/*
* Copyright (C) 2014 Tim Bray <tbray@textuality.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.util;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Minimal hierarchy selector
*
* This is for picking out an item in a large multilevel JSON object, for example look at
* the Keybase.io User object, documentation at https://keybase.io/__/api-docs/1.0#user-objects
* an example available via
* curl https://keybase.io/_/api/1.0/user/lookup.json?username=timbray
*
* If you want to retrieve the ascii-armored key, you'd say
* String key = JWalk.getString(match,"them", "public_keys", "primary", "bundle");
*/
public class JWalk {
/**
* Returns an int member value from the JSON sub-object addressed by the path
*
* @param json The object
* @param path list of string object member selectors
* @return the int addressed by the path, assuming such a thing exists
* @throws JSONException if any step in the path doesn’t work
*/
public static int getInt(JSONObject json, String... path) throws JSONException {
json = walk(json, path);
return json.getInt(path[path.length - 1]);
}
/**
* Returns a long member value from the JSON sub-object addressed by the path
*
* @param json The object
* @param path list of string object member selectors
* @return the int addressed by the path, assuming such a thing exists
* @throws JSONException if any step in the path doesn’t work
*/
public static long getLong(JSONObject json, String... path) throws JSONException {
json = walk(json, path);
return json.getLong(path[path.length - 1]);
}
/**
* Returns a String member value from the JSON sub-object addressed by the path
*
* @param json The object
* @param path list of string object member selectors
* @return the int addressed by the path, assuming such a thing exists
* @throws JSONException if any step in the path doesn’t work
*/
public static String getString(JSONObject json, String... path) throws JSONException {
json = walk(json, path);
return json.getString(path[path.length - 1]);
}
/**
* Returns a JSONArray member value from the JSON sub-object addressed by the path
*
* @param json The object
* @param path list of string object member selectors
* @return the int addressed by the path, assuming such a thing exists
* @throws JSONException if any step in the path doesn’t work
*/
public static JSONArray getArray(JSONObject json, String... path) throws JSONException {
json = walk(json, path);
return json.getJSONArray(path[path.length - 1]);
}
/**
* Returns a JSONObject member value from the JSON sub-object addressed by the path, or null
*
* @param json The object
* @param path list of string object member selectors
* @return the int addressed by the path, assuming such a thing exists
* @throws JSONException if any step in the path, except for the last, doesn’t work
*/
public static JSONObject optObject(JSONObject json, String... path) throws JSONException {
json = walk(json, path);
return json.optJSONObject(path[path.length - 1]);
}
private static JSONObject walk(JSONObject json, String... path) throws JSONException {
int len = path.length - 1;
int pathIndex = 0;
try {
while (pathIndex < len) {
json = json.getJSONObject(path[pathIndex]);
pathIndex++;
}
} catch (JSONException e) {
// try to give ’em a nice-looking error
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
sb.append(path[i]).append('.');
}
sb.append(path[len]);
throw new JSONException("JWalk error at step " + pathIndex + " of " + sb);
}
return json;
}
}
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