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     "source": [
      "Configure authentication to Earth Engine"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Declare an authentication token that was generated outside of the IPython Notebook using the instructions found in the Setting Up Authentication Credentials section of the [Python API Installation and Access](https://sites.google.com/site/earthengineapidocs/python-api) page of the Earth Engine API documentation."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import ee\n",
      "import errno\n",
      "import json\n",
      "import os\n",
      "import urllib\n",
      "import urllib2\n",
      "from IPython.display import HTML\n",
      "from IPython.display import display\n",
      "from ee.oauthinfo import OAuthInfo\n",
      "\n",
      "# This URI prompts user to copy and paste a code after successful                                        \n",
      "# authorization.                                                                                         \n",
      "ee_redirect_uri = 'urn:ietf:wg:oauth:2.0:oob'\n",
      "\n",
      "\n",
      "def create_auth_url():\n",
      "  # TODO(user): Add an additional, non-commandline flow for iPython notebook                               \n",
      "  # for added convenience, and to work in notebook environments where                                      \n",
      "  # commandline isn't available.                                                                           \n",
      "\n",
      "  # This implements the flow from:                                                                         \n",
      "  # https://developers.google.com/accounts/docs/OAuth2ForDevices                                           \n",
      "\n",
      "  ### Request authorization from user                                                                      \n",
      "\n",
      "  auth_request_params = {\n",
      "      'scope': OAuthInfo.SCOPE,\n",
      "      'redirect_uri': ee_redirect_uri,\n",
      "      'response_type': 'code',\n",
      "      'client_id': OAuthInfo.CLIENT_ID\n",
      "  }\n",
      "  auth_request_url = ('https://accounts.google.com/o/oauth2/auth?' +\n",
      "                      urllib.urlencode(auth_request_params))\n",
      "\n",
      "  return auth_request_url\n",
      "\n",
      "\n",
      "def ee_authenticate(auth_code):\n",
      "  token_request_params = {\n",
      "    'code': auth_code,\n",
      "    'client_id': OAuthInfo.CLIENT_ID,\n",
      "    'client_secret': OAuthInfo.CLIENT_SECRET,\n",
      "    'redirect_uri': ee_redirect_uri,\n",
      "    'grant_type': 'authorization_code'\n",
      "  }\n",
      "\n",
      "  refresh_token = None\n",
      "  try:\n",
      "    response = urllib2.urlopen('https://accounts.google.com/o/oauth2/token',\n",
      "                               urllib.urlencode(token_request_params)).read()\n",
      "    tokens = json.loads(response)\n",
      "    refresh_token = tokens['refresh_token']\n",
      "  except urllib2.HTTPError, e:\n",
      "    raise Exception('Problem requesting tokens.  Please try again.  %s %s' %\n",
      "                    (e, e.read()))\n",
      "\n",
      "  ### Write refresh token to filesystem for later use                                                      \n",
      "\n",
      "  credentials_path = OAuthInfo.credentials_path()\n",
      "  dirname = os.path.dirname(credentials_path)\n",
      "  try:\n",
      "    os.makedirs(dirname)\n",
      "  except OSError, e:\n",
      "    if e.errno != errno.EEXIST:\n",
      "      raise Exception('Error creating %s: %s' % (dirname, e))\n",
      "\n",
      "  json.dump({'refresh_token': refresh_token}, open(credentials_path, 'w'))\n",
      "\n",
      "  print '\\nSuccessfully saved authorization to %s' % credentials_path\n",
      "  ee.Initialize()\n",
      "  return True\n",
      "\n",
      "def auth_html():\n",
      "    return HTML(\n",
      "(\"\"\"You need to authorize access to your Earth Engine account.<br>\n",
      "Please follow <a href=\"%s\" target=\"_blank\">this link</a>, \"\"\" % create_auth_url()) +\n",
      "\n",
      "\"\"\"and paste the token you receive after authorization here: \n",
      "<input id=\"ee_auth_token\" type=\"password\"></input>\n",
      "<button id = \"ee_authenticate\">Submit</button> <span id=\"ee_auth_result\"></span>\n",
      "\n",
      "<script>\n",
      "\n",
      "// Send auth token to python\n",
      "function ee_authenticate(token, callback) {\n",
      "  cmd =  'ee_authenticate(' + JSON.stringify(token) + ')'\n",
      "  console.log(cmd);\n",
      "  function cb(msg) {\n",
      "    console.log(msg);\n",
      "    console.log(msg.content.data['text/plain'] == 'True');\n",
      "    callback(msg.content.data['text/plain'] == 'True')\n",
      "  }\n",
      "  IPython.notebook.kernel.execute(cmd, \n",
      "                                  {iopub: {output: cb}}, {silent: false});\n",
      "}\n",
      "\n",
      "$('#ee_authenticate').click(function() {\n",
      "    $('#ee_auth_result').text('...');\n",
      "    console.log('debug 1');\n",
      "    ee_authenticate($('#ee_auth_token').val(),\n",
      "                    function(success) {\n",
      "                      console.log('debug 2');\n",
      "                      $('#ee_auth_result').text(success ? 'Success' : 'Failed');\n",
      "                    });\n",
      "});\n",
      "\n",
      "</script>\n",
      "\"\"\")\n",
      "\n",
      "# For now, call ee_initialize() instead of ee.Initialize()\n",
      "def ee_initialize():\n",
      "    try:\n",
      "        ee.Initialize()\n",
      "        display(HTML(\"\"\"Authentication successful!\"\"\"))\n",
      "    except ee.EEException, e:\n",
      "        display(auth_html())"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
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