def post(self, slug):
        '''
        When post request is received, contact of which slug is equal to
        slug is retrieved. If its state is Pending or Error, the contact
        request is send again.
        '''

        logger = logging.getLogger("newebe.contact")

        self.contact = ContactManager.getContact(slug)
        owner = UserManager.getUser()

        if self.contact and self.contact.url != owner.url:
            try:
                data = owner.asContact().toJson()

                client = ContactClient()
                client.post(self.contact, "contacts/request/", data, 
                            self.on_contact_response)

            except Exception:
                import traceback
                logger.error("Error on adding contact:\n %s" % 
                        traceback.format_exc())

                self.contact.state = STATE_ERROR
                self.contact.save()

            self.return_one_document(self.contact)
        else:
            self.return_failure("Contact does not exist", 404)

    def put(self):
        '''
        Delete picture of which data are given inside request.
        Picture is found with contact key and creation date.

        If author is not inside trusted contacts, the request is rejected.
        '''

        data = self.get_body_as_dict()

        if data:
            contact = ContactManager.getTrustedContact(
                    data.get("authorKey", ""))
            
            if contact:
                picture = PictureManager.get_contact_picture(
                        contact.key, data.get("date", ""))

                if picture:
                    self.create_deletion_activity(contact, 
                            picture, "deletes", "picture")
                    picture.delete()

                self.return_success("Deletion succeeds")

            else:
                self.return_failure("Author is not trusted.", 400)      


        else:
            self.return_failure("No data sent.", 405)

    def get(self):
        '''
        Retrieves whole contact list at JSON format.
        '''
        contacts = ContactManager.getContacts()

        self.return_documents(contacts)

    def delete(self, slug):
        '''
        Deletes contact corresponding to slug.
        '''

        contact = ContactManager.getContact(slug)
        if contact:
            contact.delete()
            return self.return_success("Contact has been deleted.")
        else:
            self.return_failure("Contact does not exist.")

def check_that_request_date_is_set_to_europe_paris_timezone(step, timezone):
    Contact._db = db2
    contact = ContactManager.getRequestedContacts().first()
    Contact._db = db

    date = date_util.get_date_from_db_date(world.contacts[0]["requestDate"])
    tz = pytz.timezone(timezone)
    date = date.replace(tzinfo=tz)
    assert_equals(
            date_util.convert_utc_date_to_timezone(contact.requestDate, tz),
            date)

    def send_creation_to_contacts(self, path, doc):
        '''
        Sends a POST request to all trusted contacts.

        Request body contains object to post at JSON format.
        '''

        contacts = ContactManager.getTrustedContacts()
        client = ContactClient(self.activity)
        for contact in contacts:
            try:
                client.post(contact, path, doc.toJson(localized=False))
            except HTTPError:
                self.activity.add_error(contact)
                self.activity.save()

    def send_profile_to_contacts(self):
        '''
        External methods to not send too much times the changed profile. 
        A timer is set to wait for other modifications before running this
        function that sends modification requests to every contacts.
        '''

        client = HTTPClient()
        self.sending_data = False

        user = UserManager.getUser()
        jsonbody = user.toJson()

        activity = Activity(
            authorKey = user.key,
            author = user.name,
            verb = "modifies",
            docType = "profile",
            method = "PUT",
            docId = "none",
            isMine = True
        )
        activity.save()     

        for contact in ContactManager.getTrustedContacts():

            try:
                request = HTTPRequest("%scontacts/update-profile/" % contact.url, 
                             method="PUT", body=jsonbody, validate_cert=False)
        
                response = client.fetch(request)

                if response.error:
                    logger.error("""
                        Profile sending to a contact failed, error infos are 
                        stored inside activity.
                    """)
                    activity.add_error(contact)
                    activity.save()
            except:
                logger.error("""
                    Profile sending to a contact failed, error infos are 
                    stored inside activity.
                """)
                activity.add_error(contact)
                activity.save()

            logger.info("Profile update sent to all contacts.")

    def send_files_to_contacts(self, path, fields, files):
        '''
        Sends in a form given file and fields to all trusted contacts (at given
        path).

        If any error occurs, it is stored in linked activity.
        '''

        contacts = ContactManager.getTrustedContacts()
        client = ContactClient(self.activity)
        for contact in contacts:
            try:
                client.post_files(contact, path, fields = fields, files = files)
            except HTTPError:
                self.activity.add_error(contact)
                self.activity.save()

    def get(self):
        '''
        Asks for all contacts to resend their data from last month. 
        As answer contacts send their profile. So contact data are updated, 
        then contacts resend all their from their last month just like they 
        were posted now.
        Current newebe has to check himself if he already has these data.
        '''

        client = ContactClient()
        user = UserManager.getUser()

        self.contacts = dict()
        for contact in ContactManager.getTrustedContacts():
            self.ask_to_contact_for_sync(client, user, contact)

        self.return_success("", 200)

    def send_deletion_to_contacts(self, path, doc):
        '''
        Send a delete request (PUT because Tornado don't handle DELETE request
        with a body) to all trusted contacts.

        Request body contains object to delete at JSON format.
        '''

        contacts = ContactManager.getTrustedContacts()
        client = ContactClient(self.activity)
        date = date_util.get_db_date_from_date(doc.date)

        for contact in contacts:
            try:
                client.delete(contact, path, doc.toJson(localized=False), date)
            except HTTPError:
                import pdb
                pdb.set_trace()
                self.activity.add_error(contact, extra=date)
                self.activity.save()

    def on_picture_found(self, picture, id):        
        '''
        '''

        self.picture = picture

        data = dict()
        data["picture"] = picture.toDict(localized=False)
        data["contact"] = UserManager.getUser().asContact().toDict()

        contact = ContactManager.getTrustedContact(picture.authorKey)
        
        client = ContactClient()
        body = json_encode(data)
        
        try:
            client.post(contact,  u"pictures/contact/download/", 
                        body, self.on_download_finished)
        except HTTPError:
            self.return_failure("Cannot download picture from contact.")

    def post(self):
        '''
        When sync request is received, if contact is a trusted contact, it
        sends again all posts from last month to contact.
        '''
            
        client = ContactClient()
        now = datetime.datetime.utcnow() 
        date = now - datetime.timedelta(365/12)

        contact = self.get_body_as_dict()
        localContact = ContactManager.getTrustedContact(contact.get("key", ""))

        if localContact:
            self.send_posts_to_contact(client, localContact, now, date)
            self.send_pictures_to_contact(client, localContact, now, date)

            self.return_document(UserManager.getUser().asContact())
        else:
            self.return_failure("Contact does not exist.")