#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2013, Romeo Theriault <romeot () hawaii.edu>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
#
# see examples/playbooks/uri.yml

import shutil
import tempfile
import base64
import datetime
try:
    import json
except ImportError:
    import simplejson as json

DOCUMENTATION = '''
---
module: uri
short_description: Interacts with webservices
description:
  - Interacts with HTTP and HTTPS web services and supports Digest, Basic and WSSE
    HTTP authentication mechanisms.
version_added: "1.1"
options:
  url:
    description:
      - HTTP or HTTPS URL in the form (http|https)://host.domain[:port]/path
    required: true
    default: null
    aliases: []
  dest:
    description:
      - path of where to download the file to (if desired). If I(dest) is a directory, the basename of the file on the remote server will be used.
    required: false
    default: null
  user:
    description:
      - username for the module to use for Digest, Basic or WSSE authentication.
    required: false
    default: null
  password:
    description:
      - password for the module to use for Digest, Basic or WSSE authentication.
    required: false
    default: null
  body:
    description:
      - The body of the http request/response to the web service.
    required: false
    default: null
  method:
    description:
      - The HTTP method of the request or response.
    required: false
    choices: [ "GET", "POST", "PUT", "HEAD", "DELETE", "OPTIONS" ]
    default: "GET"
  return_content:
    description:
      - Whether or not to return the body of the request as a "content" key in the dictionary result. If the reported Content-type is "application/json", then the JSON is additionally loaded into a key called C(json) in the dictionary results.
    required: false
    choices: [ "yes", "no" ]
    default: "no"
  force_basic_auth:
    description:
      - httplib2, the library used by the uri module only sends authentication information when a webservice
        responds to an initial request with a 401 status. Since some basic auth services do not properly
        send a 401, logins will fail. This option forces the sending of the Basic authentication header
        upon initial request.
    required: false
    choices: [ "yes", "no" ]
    default: "no"
  follow_redirects:
    description:
      - Whether or not the URI module should follow all redirects.
    required: false
    choices: [ "yes", "no" ]
    default: "no"
  creates:
    description:
      - a filename, when it already exists, this step will not be run.
    required: false
  removes:
    description:
      - a filename, when it does not exist, this step will not be run.
    required: false
  status_code:
    description:
      - A valid, numeric, HTTP status code that signifies success of the request.
    required: false
    default: 200
  timeout:
    description:
      - The socket level timeout in seconds 
    required: false
    default: 30
  HEADER_:
    description:
      - Any parameter starting with "HEADER_" is a sent with your request as a header.
        For example, HEADER_Content-Type="application/json" would send the header
        "Content-Type" along with your request with a value of "application/json".
    required: false
    default: null
  others:
    description:
      - all arguments accepted by the M(file) module also work here
    required: false

# informational: requirements for nodes
requirements: [ urlparse, httplib2 ]
author: Romeo Theriault
'''

EXAMPLES = '''
# Check that you can connect (GET) to a page and it returns a status 200
- uri: url=http://www.example.com

# Check that a page returns a status 200 and fail if the word AWESOME is not in the page contents.
- action: uri url=http://www.example.com return_content=yes
  register: webpage

- action: fail
  when_string: '"AWESOME" not in "${webpage.content}"'


# Create a JIRA issue.
- action: >
        uri url=https://your.jira.example.com/rest/api/2/issue/ 
        method=POST user=your_username password=your_pass 
        body='$FILE(issue.json)' force_basic_auth=yes 
        status_code=201 HEADER_Content-Type="application/json"  

- action: > 
        uri url=https://your.form.based.auth.examle.com/index.php 
        method=POST body="name=your_username&password=your_password&enter=Sign%20in" 
        status_code=302 HEADER_Content-Type="application/x-www-form-urlencoded"
  register: login

# Login to a form based webpage, then use the returned cookie to
# access the app in later tasks.
- action: uri url=https://your.form.based.auth.example.com/dashboard.php
            method=GET return_content=yes HEADER_Cookie="${login.set_cookie}"
'''

HAS_HTTPLIB2 = True
try:
    import httplib2
except ImportError:
    HAS_HTTPLIB2 = False

HAS_URLPARSE = True

try:
    import urlparse
    import socket
except ImportError:
    HAS_URLPARSE = False


def write_file(module, url, dest, content):
    # create a tempfile with some test content
    fd, tmpsrc = tempfile.mkstemp()
    f = open(tmpsrc, 'wb')
    try:
        f.write(content)
    except Exception, err:
        os.remove(tmpsrc)
        module.fail_json(msg="failed to create temporary content file: %s" % str(err))
    f.close()
 
    md5sum_src   = None
    md5sum_dest  = None
 
    # raise an error if there is no tmpsrc file
    if not os.path.exists(tmpsrc):
        os.remove(tmpsrc)
        module.fail_json(msg="Source %s does not exist" % (tmpsrc))
    if not os.access(tmpsrc, os.R_OK):
        os.remove(tmpsrc)
        module.fail_json( msg="Source %s not readable" % (tmpsrc))
    md5sum_src = module.md5(tmpsrc)
 
    # check if there is no dest file
    if os.path.exists(dest):
        # raise an error if copy has no permission on dest
        if not os.access(dest, os.W_OK):
            os.remove(tmpsrc)
            module.fail_json( msg="Destination %s not writable" % (dest))
        if not os.access(dest, os.R_OK):
            os.remove(tmpsrc)
            module.fail_json( msg="Destination %s not readable" % (dest))
        md5sum_dest = module.md5(dest)
    else:
        if not os.access(os.path.dirname(dest), os.W_OK):
            os.remove(tmpsrc)
            module.fail_json( msg="Destination dir %s not writable" % (os.path.dirname(dest)))
     
    if md5sum_src != md5sum_dest:
        try:
            shutil.copyfile(tmpsrc, dest)
        except Exception, err:
            os.remove(tmpsrc)
            module.fail_json(msg="failed to copy %s to %s: %s" % (tmpsrc, dest, str(err)))
 
    os.remove(tmpsrc)


def url_filename(url):
    fn = os.path.basename(urlparse.urlsplit(url)[2])
    if fn == '':
        return 'index.html'
    return fn


def uri(module, url, dest, user, password, body, method, headers, redirects, socket_timeout):
    # To debug
    #httplib2.debug = 4

    # Create a Http object and set some default options.
    h = httplib2.Http(disable_ssl_certificate_validation=True, timeout=socket_timeout)
    h.follow_all_redirects = redirects
    h.forward_authorization_headers = True

    # If they have a username or password verify they have both, then add them to the request
    if user is not None and password is None:
        module.fail_json(msg="Both a username and password need to be set.")
    if password is not None and user is None:
        module.fail_json(msg="Both a username and password need to be set.")
    if user is not None and password is not None:
        h.add_credentials(user, password)

    # is dest is set and is a directory, let's check if we get redirected and
    # set the filename from that url
    redirected = False
    resp_redir = {}
    r = {}
    if dest is not None:
        dest = os.path.expanduser(dest)
        if os.path.isdir(dest):
            # first check if we are redirected to a file download
            h.follow_redirects=False
            # Try the request
            try:
                resp_redir, content_redir = h.request(url, method=method, body=body, headers=headers)
                # if we are redirected, update the url with the location header,
                # and update dest with the new url filename
            except:
                pass
            if resp_redir['status'] in ["301", "302", "303", "307"]:
                url = resp_redir['location']
                redirected = True
            dest = os.path.join(dest, url_filename(url))
        # if destination file already exist, only download if file newer
        if os.path.exists(dest):
            t = datetime.datetime.utcfromtimestamp(os.path.getmtime(dest))
            tstamp = t.strftime('%a, %d %b %Y %H:%M:%S +0000')
            headers['If-Modified-Since'] = tstamp

    # do safe redirects now, including 307
    h.follow_redirects=True

    # Make the request, or try to :)
    try: 
        resp, content = h.request(url, method=method, body=body, headers=headers)     
        r['redirected'] = redirected
        r.update(resp_redir)
        r.update(resp)
        return r, content, dest
    except httplib2.RedirectMissingLocation:
        module.fail_json(msg="A 3xx redirect response code was provided but no Location: header was provided to point to the new location.")
    except httplib2.RedirectLimit:
        module.fail_json(msg="The maximum number of redirections was reached without coming to a final URI.")
    except httplib2.ServerNotFoundError:
        module.fail_json(msg="Unable to resolve the host name given.")
    except httplib2.RelativeURIError:
        module.fail_json(msg="A relative, as opposed to an absolute URI, was passed in.")
    except httplib2.FailedToDecompressContent:
        module.fail_json(msg="The headers claimed that the content of the response was compressed but the decompression algorithm applied to the content failed.")
    except httplib2.UnimplementedDigestAuthOptionError:
        module.fail_json(msg="The server requested a type of Digest authentication that we are unfamiliar with.")
    except httplib2.UnimplementedHmacDigestAuthOptionError:
        module.fail_json(msg="The server requested a type of HMACDigest authentication that we are unfamiliar with.")
    except httplib2.UnimplementedHmacDigestAuthOptionError:
        module.fail_json(msg="The server requested a type of HMACDigest authentication that we are unfamiliar with.")
    except socket.error, e:
        module.fail_json(msg="Socket error: %s to %s" % (e, url))

def main():

    module = AnsibleModule(
        argument_spec = dict(
            url = dict(required=True),
            dest = dict(required=False, default=None),
            user = dict(required=False, default=None),
            password = dict(required=False, default=None),
            body = dict(required=False, default=None),
            method = dict(required=False, default='GET', choices=['GET', 'POST', 'PUT', 'HEAD', 'DELETE', 'OPTIONS']),
            return_content = dict(required=False, default='no', type='bool'),
            force_basic_auth = dict(required=False, default='no', type='bool'),
            follow_redirects = dict(required=False, default='no', type='bool'),
            creates = dict(required=False, default=None),
            removes = dict(required=False, default=None),
            status_code = dict(required=False, default="200"),
            timeout = dict(required=False, default=30, type='int'),
        ),
        check_invalid_arguments=False,
        add_file_common_args=True
    )

    if not HAS_HTTPLIB2:
        module.fail_json(msg="httplib2 is not installed")
    if not HAS_URLPARSE:
        module.fail_json(msg="urlparse is not installed")

    url  = module.params['url']
    user = module.params['user']
    password = module.params['password']
    body = module.params['body']
    method = module.params['method']
    dest = module.params['dest']
    return_content = module.params['return_content']
    force_basic_auth = module.params['force_basic_auth']
    follow_redirects = module.params['follow_redirects']
    creates = module.params['creates']
    removes = module.params['removes']
    status_code = module.params['status_code']
    socket_timeout = module.params['timeout']

    # Grab all the http headers. Need this hack since passing multi-values is currently a bit ugly. (e.g. headers='{"Content-Type":"application/json"}')
    dict_headers = {}
    for key, value in module.params.iteritems():
        if key.startswith("HEADER_"):
            skey = key.replace("HEADER_", "")
            dict_headers[skey] = value

  
    if creates is not None:
        # do not run the command if the line contains creates=filename
        # and the filename already exists.  This allows idempotence
        # of uri executions.
        creates = os.path.expanduser(creates)
        if os.path.exists(creates):
            module.exit_json(stdout="skipped, since %s exists" % creates, skipped=True, changed=False, stderr=False, rc=0)

    if removes is not None:
        # do not run the command if the line contains removes=filename
        # and the filename do not exists.  This allows idempotence
        # of uri executions.
        v = os.path.expanduser(removes)
        if not os.path.exists(removes):
            module.exit_json(stdout="skipped, since %s does not exist" % removes, skipped=True, changed=False, stderr=False, rc=0)


    # httplib2 only sends authentication after the server asks for it with a 401.
    # Some 'basic auth' servies fail to send a 401 and require the authentication
    # up front. This creates the Basic authentication header and sends it immediately. 
    if force_basic_auth:
        dict_headers["Authorization"] = "Basic {0}".format(base64.b64encode("{0}:{1}".format(user, password))) 

    # Redirects         
    if follow_redirects:
        redirects = True        
    else:
        redirects = False

    # Make the request
    resp, content, dest = uri(module, url, dest, user, password, body, method, dict_headers, redirects, socket_timeout)

    # Write the file out if requested
    if dest is not None:
        if resp['status'] == "304":
            status_code = "304"
            changed = False
        else:
            write_file(module, url, dest, content)
            # allow file attribute changes
            changed = True
            module.params['path'] = dest
            file_args = module.load_file_common_arguments(module.params)
            file_args['path'] = dest
            changed = module.set_file_attributes_if_different(file_args, changed)
        resp['path'] = dest
    else:
        changed = False

    # Transmogrify the headers, replacing '-' with '_', since variables dont work with dashes.
    uresp = {}
    for key, value in resp.iteritems():
        ukey = key.replace("-", "_")  
        uresp[ukey] = value

    if 'content_type' in uresp:
        if uresp['content_type'].startswith('application/json'):
            try:
                js = json.loads(content)
                uresp['json'] = js
            except:
                pass
    if resp['status'] != status_code:
        module.fail_json(msg="Status code was not " + status_code, content=content, **uresp)
    elif return_content:
        module.exit_json(changed=changed, content=content, **uresp)
    else:
        module.exit_json(changed=changed, **uresp)


# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
