PayPal Access OAuth 2 Python sample code

oauth2-python-ppaccess/app.yaml

@@ -0,0 +1,8 @@
+application: oauth2-paypal
+version: 1
+runtime: python
+api_version: 1
+
+handlers:
+- url: /.*
+  script: index.py

oauth2-python-ppaccess/index.py

@@ -0,0 +1,51 @@
+import cgi
+import urllib
+import urllib2
+import json
+
+#client OAuth keys
+key = 'YOUR KEY HERE'
+secret = 'YOUR SECRET HERE'
+
+#PayPal URIs and application callbacks
+callback_url = "YOUR CALLBACK URL"
+authorization_endpoint = "https://identity.x.com/xidentity/resources/authorize"
+access_token_endpoint = "https://identity.x.com/xidentity/oauthtokenservice"
+profile_endpoint = "https://identity.x.com/xidentity/resources/profile/me"
+
+#get query string parameters
+params = cgi.FieldStorage()
+
+"""
+" If a code parameter is available in the query string then the user
+" has given the client permission to access their protected data.
+" If not, the script should forward the user to log in and accept
+" the application permissions.
+"""
+if params.has_key('code'):
+    code = params['code'].value
+
+    #construct POST object for access token fetch request
+    postvals = {'grant_type': 'authorization_code', 'client_id': key, 'client_secret': secret, 'code': code, 'redirect_uri': callback_url, 'redirect_uri': callback_url}
+
+    #make request to capture access token
+    params = urllib.urlencode(postvals)
+    f = urllib.urlopen(access_token_endpoint, params)
+    token = json.read(f.read())
+
+    #make OAuth signed request for protected user profile
+    profile_url = "%s?oauth_token=%s" % (profile_endpoint, token['access_token'])
+    request = urllib2.Request(profile_url)
+    response = urllib2.urlopen(request)
+    profile = response.read()
+
+    #print profile data response
+    print 'Content-Type: text/plain'
+    print ''
+    print profile
+else:
+    #construct PayPal authorization URI
+    auth_url = "%s?scope=%s&response_type=code&redirect_uri=%s&client_id=%s" % (authorization_endpoint, profile_endpoint, callback_url, key)
+
+    #redirect the user to the PayPal authorization URI
+    print "Location: " + auth_url

oauth2-python-ppaccess/json.py

@@ -0,0 +1,310 @@
+import string
+import types
+
+##    json.py implements a JSON (http://json.org) reader and writer.
+##    Copyright (C) 2005  Patrick D. Logan
+##    Contact mailto:patrickdlogan@stardecisions.com
+##
+##    This library is free software; you can redistribute it and/or
+##    modify it under the terms of the GNU Lesser General Public
+##    License as published by the Free Software Foundation; either
+##    version 2.1 of the License, or (at your option) any later version.
+##
+##    This library 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
+##    Lesser General Public License for more details.
+##
+##    You should have received a copy of the GNU Lesser General Public
+##    License along with this library; if not, write to the Free Software
+##    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+class _StringGenerator(object):
+	def __init__(self, string):
+		self.string = string
+		self.index = -1
+	def peek(self):
+		i = self.index + 1
+		if i < len(self.string):
+			return self.string[i]
+		else:
+			return None
+	def next(self):
+		self.index += 1
+		if self.index < len(self.string):
+			return self.string[self.index]
+		else:
+			raise StopIteration
+	def all(self):
+		return self.string
+
+class WriteException(Exception):
+    pass
+
+class ReadException(Exception):
+    pass
+
+class JsonReader(object):
+    hex_digits = {'A': 10,'B': 11,'C': 12,'D': 13,'E': 14,'F':15}
+    escapes = {'t':'\t','n':'\n','f':'\f','r':'\r','b':'\b'}
+
+    def read(self, s):
+        self._generator = _StringGenerator(s)
+        result = self._read()
+        return result
+
+    def _read(self):
+        self._eatWhitespace()
+        peek = self._peek()
+        if peek is None:
+            raise ReadException, "Nothing to read: '%s'" % self._generator.all()
+        if peek == '{':
+            return self._readObject()
+        elif peek == '[':
+            return self._readArray()            
+        elif peek == '"':
+            return self._readString()
+        elif peek == '-' or peek.isdigit():
+            return self._readNumber()
+        elif peek == 't':
+            return self._readTrue()
+        elif peek == 'f':
+            return self._readFalse()
+        elif peek == 'n':
+            return self._readNull()
+        elif peek == '/':
+            self._readComment()
+            return self._read()
+        else:
+            raise ReadException, "Input is not valid JSON: '%s'" % self._generator.all()
+
+    def _readTrue(self):
+        self._assertNext('t', "true")
+        self._assertNext('r', "true")
+        self._assertNext('u', "true")
+        self._assertNext('e', "true")
+        return True
+
+    def _readFalse(self):
+        self._assertNext('f', "false")
+        self._assertNext('a', "false")
+        self._assertNext('l', "false")
+        self._assertNext('s', "false")
+        self._assertNext('e', "false")
+        return False
+
+    def _readNull(self):
+        self._assertNext('n', "null")
+        self._assertNext('u', "null")
+        self._assertNext('l', "null")
+        self._assertNext('l', "null")
+        return None
+
+    def _assertNext(self, ch, target):
+        if self._next() != ch:
+            raise ReadException, "Trying to read %s: '%s'" % (target, self._generator.all())
+
+    def _readNumber(self):
+        isfloat = False
+        result = self._next()
+        peek = self._peek()
+        while peek is not None and (peek.isdigit() or peek == "."):
+            isfloat = isfloat or peek == "."
+            result = result + self._next()
+            peek = self._peek()
+        try:
+            if isfloat:
+                return float(result)
+            else:
+                return int(result)
+        except ValueError:
+            raise ReadException, "Not a valid JSON number: '%s'" % result
+
+    def _readString(self):
+        result = ""
+        assert self._next() == '"'
+        try:
+            while self._peek() != '"':
+                ch = self._next()
+                if ch == "\\":
+                    ch = self._next()
+                    if ch in 'brnft':
+                        ch = self.escapes[ch]
+                    elif ch == "u":
+		        ch4096 = self._next()
+			ch256  = self._next()
+			ch16   = self._next()
+			ch1    = self._next()
+			n = 4096 * self._hexDigitToInt(ch4096)
+			n += 256 * self._hexDigitToInt(ch256)
+			n += 16  * self._hexDigitToInt(ch16)
+			n += self._hexDigitToInt(ch1)
+			ch = unichr(n)
+                    elif ch not in '"/\\':
+                        raise ReadException, "Not a valid escaped JSON character: '%s' in %s" % (ch, self._generator.all())
+                result = result + ch
+        except StopIteration:
+            raise ReadException, "Not a valid JSON string: '%s'" % self._generator.all()
+        assert self._next() == '"'
+        return result
+
+    def _hexDigitToInt(self, ch):
+        try:
+            result = self.hex_digits[ch.upper()]
+        except KeyError:
+            try:
+                result = int(ch)
+	    except ValueError:
+	         raise ReadException, "The character %s is not a hex digit." % ch
+        return result
+
+    def _readComment(self):
+        assert self._next() == "/"
+        second = self._next()
+        if second == "/":
+            self._readDoubleSolidusComment()
+        elif second == '*':
+            self._readCStyleComment()
+        else:
+            raise ReadException, "Not a valid JSON comment: %s" % self._generator.all()
+
+    def _readCStyleComment(self):
+        try:
+            done = False
+            while not done:
+                ch = self._next()
+                done = (ch == "*" and self._peek() == "/")
+                if not done and ch == "/" and self._peek() == "*":
+                    raise ReadException, "Not a valid JSON comment: %s, '/*' cannot be embedded in the comment." % self._generator.all()
+            self._next()
+        except StopIteration:
+            raise ReadException, "Not a valid JSON comment: %s, expected */" % self._generator.all()
+
+    def _readDoubleSolidusComment(self):
+        try:
+            ch = self._next()
+            while ch != "\r" and ch != "\n":
+                ch = self._next()
+        except StopIteration:
+            pass
+
+    def _readArray(self):
+        result = []
+        assert self._next() == '['
+        done = self._peek() == ']'
+        while not done:
+            item = self._read()
+            result.append(item)
+            self._eatWhitespace()
+            done = self._peek() == ']'
+            if not done:
+                ch = self._next()
+                if ch != ",":
+                    raise ReadException, "Not a valid JSON array: '%s' due to: '%s'" % (self._generator.all(), ch)
+        assert ']' == self._next()
+        return result
+
+    def _readObject(self):
+        result = {}
+        assert self._next() == '{'
+        done = self._peek() == '}'
+        while not done:
+            key = self._read()
+            if type(key) is not types.StringType:
+                raise ReadException, "Not a valid JSON object key (should be a string): %s" % key
+            self._eatWhitespace()
+            ch = self._next()
+            if ch != ":":
+                raise ReadException, "Not a valid JSON object: '%s' due to: '%s'" % (self._generator.all(), ch)
+            self._eatWhitespace()
+            val = self._read()
+            result[key] = val
+            self._eatWhitespace()
+            done = self._peek() == '}'
+            if not done:
+                ch = self._next()
+                if ch != ",":
+                    raise ReadException, "Not a valid JSON array: '%s' due to: '%s'" % (self._generator.all(), ch)
+	assert self._next() == "}"
+        return result
+
+    def _eatWhitespace(self):
+        p = self._peek()
+        while p is not None and p in string.whitespace or p == '/':
+            if p == '/':
+                self._readComment()
+            else:
+                self._next()
+            p = self._peek()
+
+    def _peek(self):
+        return self._generator.peek()
+
+    def _next(self):
+        return self._generator.next()
+
+class JsonWriter(object):
+
+    def _append(self, s):
+        self._results.append(s)
+
+    def write(self, obj, escaped_forward_slash=False):
+        self._escaped_forward_slash = escaped_forward_slash
+        self._results = []
+        self._write(obj)
+        return "".join(self._results)
+
+    def _write(self, obj):
+        ty = type(obj)
+        if ty is types.DictType:
+            n = len(obj)
+            self._append("{")
+            for k, v in obj.items():
+                self._write(k)
+                self._append(":")
+                self._write(v)
+                n = n - 1
+                if n > 0:
+                    self._append(",")
+            self._append("}")
+        elif ty is types.ListType or ty is types.TupleType:
+            n = len(obj)
+            self._append("[")
+            for item in obj:
+                self._write(item)
+                n = n - 1
+                if n > 0:
+                    self._append(",")
+            self._append("]")
+        elif ty is types.StringType or ty is types.UnicodeType:
+            self._append('"')
+	    obj = obj.replace('\\', r'\\')
+            if self._escaped_forward_slash:
+                obj = obj.replace('/', r'\/')
+	    obj = obj.replace('"', r'\"')
+	    obj = obj.replace('\b', r'\b')
+	    obj = obj.replace('\f', r'\f')
+	    obj = obj.replace('\n', r'\n')
+	    obj = obj.replace('\r', r'\r')
+	    obj = obj.replace('\t', r'\t')
+            self._append(obj)
+            self._append('"')
+        elif ty is types.IntType or ty is types.LongType:
+            self._append(str(obj))
+        elif ty is types.FloatType:
+            self._append("%f" % obj)
+        elif obj is True:
+            self._append("true")
+        elif obj is False:
+            self._append("false")
+        elif obj is None:
+            self._append("null")
+        else:
+            raise WriteException, "Cannot write in JSON: %s" % repr(obj)
+
+def write(obj, escaped_forward_slash=False):
+    return JsonWriter().write(obj, escaped_forward_slash)
+
+def read(s):
+    return JsonReader().read(s)