From 01ac5aa11b07b418b60caa1443e4b87a006d71fd Mon Sep 17 00:00:00 2001
From: schneefux <schneefux+commit@schneefux.xyz>
Date: Fri, 2 Jan 2015 10:58:39 +0100
Subject: Added witai-stt-engine to client.stt module This was asked for in a
 comment at PR #118

---
 client/stt.py | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/client/stt.py b/client/stt.py
index 86cc83b..9277cb6 100644
--- a/client/stt.py
+++ b/client/stt.py
@@ -413,6 +413,84 @@ class AttSTT(AbstractSTTEngine):
         return diagnose.check_network_connection()
 
 
+class WitAiSTT(AbstractSTTEngine):
+    """
+    Speech-To-Text implementation which relies on the Wit.ai Speech API.
+
+    This implementation requires an Wit.ai Access Token to be present in
+    profile.yml. Please sign up at https://wit.ai and copy your instance
+    token, which can be found under Settings in the Wit console to your
+    profile.yml:
+        ...
+        stt_engine: witai
+        witai-stt:
+          access_token:    ERJKGE86SOMERANDOMTOKEN23471AB
+    """
+
+    SLUG = "witai"
+
+    def __init__(self, access_token):
+        self._logger = logging.getLogger(__name__)
+        self._token = access_token
+
+    @classmethod
+    def get_config(cls):
+        # FIXME: Replace this as soon as we have a config module
+        config = {}
+        # Try to get wit.ai Auth token from config
+        profile_path = jasperpath.config('profile.yml')
+        if os.path.exists(profile_path):
+            with open(profile_path, 'r') as f:
+                profile = yaml.safe_load(f)
+                if 'witai-stt' in profile:
+                    if 'access_token' in profile['witai-stt']:
+                        config['access_token'] = \
+                            profile['witai-stt']['access_token']
+        return config
+
+    @property
+    def token(self):
+        return self._token
+
+    def transcribe(self, fp):
+        data = fp.read()
+        headers = {'Authorization': 'Bearer %s' % self.token,
+                   'accept': 'application/json',
+                   'Content-Type': 'audio/wav'}
+        r = requests.post('https://api.wit.ai/speech?v=20140916',
+                          data=data,
+                          headers=headers)
+        try:
+            r.raise_for_status()
+        except requests.exceptions.HTTPError:
+            self._logger.critical('Request failed with response: %r',
+                                  r.text,
+                                  exc_info=True)
+            return []
+        except requests.exceptions.RequestException:
+            self._logger.critical('Request failed.', exc_info=True)
+            return []
+        else:
+            try:
+                text = r.json()['_text']
+            except ValueError as e:
+                self._logger.debug('Recognition failed with status: %s',
+                                   e.args[0])
+                return []
+            except KeyError:
+                self._logger.critical('Cannot parse response.',
+                                      exc_info=True)
+                return []
+            else:
+                transcribed = [text.upper()]
+                self._logger.info('Transcribed: %r', transcribed)
+                return transcribed
+
+    @classmethod
+    def is_available(cls):
+        return diagnose.check_network_connection()
+
+
 def get_engine_by_slug(slug=None):
     """
     Returns:
-- 
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