/**
* Translate text
*
* @param text The text to be translated
* @param target The target language code, for example "en"
* @param source The source language code, for example "nl". Optional
* @return
* @throws Exception
*/
public String translate(
@Name("text") String text,
@Name("target") String target,
@Name("source") @Required(false) String source)
throws Exception {
String key = getState().get("key", String.class);
if (key == null) {
throw new Exception(
"No valid API Key set. "
+ "Google Translate API is a paid service "
+ "and requires an API Key for billing.");
}
String url =
TRANSLATE_API_URL
+ "?q="
+ URLEncoder.encode(text, "UTF-8")
+ "&key="
+ URLEncoder.encode(key, "UTF-8")
+ "&target="
+ URLEncoder.encode(target, "UTF-8");
if (source != null) {
url += "&source=" + URLEncoder.encode(source, "UTF-8");
}
String resp = HttpUtil.get(url);
return resp;
}
private ObjectNode exchangeCodeForAuthorization(final String code) throws IOException {
final Map<String, String> params = new HashMap<String, String>();
params.put("code", code);
params.put("client_id", CLIENT_ID);
params.put("client_secret", CLIENT_SECRET);
params.put("redirect_uri", REDIRECT_URI);
params.put("grant_type", "authorization_code");
final String res = HttpUtil.postForm(OAUTH_URI + "/token", params);
final ObjectNode json = MAPPER.readValue(res, ObjectNode.class);
return json;
}
private String createAuthorizationUrl() throws IOException {
final Map<String, String> params = new HashMap<String, String>();
params.put("scope", SCOPE);
params.put("redirect_uri", REDIRECT_URI);
params.put("response_type", "code");
params.put("access_type", "offline");
params.put("client_id", CLIENT_ID);
params.put("approval_prompt", "force");
final String url = HttpUtil.appendQueryParams(OAUTH_URI + "/auth", params);
return url;
}
/**
* Evaluate given expression For example expr="2.5 + 3 / sqrt(16)" will return "3.25"
*
* @param expr
* @return result
* @throws Exception
*/
public String eval(@Name("expr") String expr) throws Exception {
String url = CALC_API_URL + "?q=" + URLEncoder.encode(expr, "UTF-8");
String resp = HttpUtil.get(url);
// the field names in resp are not enclosed by quotes :(
resp = resp.replaceAll("lhs:", "\"lhs\":");
resp = resp.replaceAll("rhs:", "\"rhs\":");
resp = resp.replaceAll("error:", "\"error\":");
resp = resp.replaceAll("icc:", "\"icc\":");
ObjectMapper mapper = JOM.getInstance();
ObjectNode json = mapper.readValue(resp, ObjectNode.class);
String error = json.get("error").asText();
if (error != null && !error.isEmpty()) {
throw new Exception(error);
}
String rhs = json.get("rhs").asText();
return rhs;
}
private void sendAuthorizationToAgent(
final String agentUrl, final String agentMethod, final ObjectNode auth) throws IOException {
final JSONRequest rpcRequest = new JSONRequest(agentMethod, auth);
HttpUtil.post(agentUrl, rpcRequest.toString());
}