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

# Copyright: (c) 2013, Romeo Theriault <romeot () hawaii.edu>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function
__metaclass__ = type


ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['stableinterface'],
                    'supported_by': 'core'}

DOCUMENTATION = r'''
---
module: uri
short_description: Interacts with webservices
description:
  - Interacts with HTTP and HTTPS web services and supports Digest, Basic and WSSE
    HTTP authentication mechanisms.
  - For Windows targets, use the M(win_uri) module instead.
version_added: "1.1"
options:
  url:
    description:
      - HTTP or HTTPS URL in the form (http|https)://host.domain[:port]/path
    required: true
  dest:
    description:
      - A 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.
  user:
    description:
      - A username for the module to use for Digest, Basic or WSSE authentication.
  password:
    description:
      - A password for the module to use for Digest, Basic or WSSE authentication.
  body:
    description:
      - The body of the http request/response to the web service. If C(body_format) is set
        to 'json' it will take an already formatted JSON string or convert a data structure
        into JSON. If C(body_format) is set to 'form-urlencoded' it will convert a dictionary
        or list of tuples into an 'application/x-www-form-urlencoded' string. (Added in v2.7)
  body_format:
    description:
      - The serialization format of the body. When set to C(json) or C(form-urlencoded), encodes the
        body argument, if needed, and automatically sets the Content-Type header accordingly.
        As of C(2.3) it is possible to override the `Content-Type` header, when
        set to C(json) or C(form-urlencoded) via the I(headers) option.
    choices: [ form-urlencoded, json, raw ]
    default: raw
    version_added: "2.0"
  method:
    description:
      - The HTTP method of the request or response. It MUST be uppercase.
    choices: [ "GET", "POST", "PUT", "HEAD", "DELETE", "OPTIONS", "PATCH", "TRACE", "CONNECT", "REFRESH" ]
    default: "GET"
  return_content:
    description:
      - Whether or not to return the body of the response 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.
    type: bool
    default: 'no'
  force_basic_auth:
    description:
      - 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.
    type: bool
    default: 'no'
  follow_redirects:
    description:
      - Whether or not the URI module should follow redirects. C(all) will follow all redirects.
        C(safe) will follow only "safe" redirects, where "safe" means that the client is only
        doing a GET or HEAD on the URI to which it is being redirected. C(none) will not follow
        any redirects. Note that C(yes) and C(no) choices are accepted for backwards compatibility,
        where C(yes) is the equivalent of C(all) and C(no) is the equivalent of C(safe). C(yes) and C(no)
        are deprecated and will be removed in some future version of Ansible.
    choices: [ all, 'none', safe ]
    default: safe
  creates:
    description:
      - A filename, when it already exists, this step will not be run.
  removes:
    description:
      - A filename, when it does not exist, this step will not be run.
  status_code:
    description:
      - A list of valid, numeric, HTTP status codes that signifies success of the
        request.
    default: 200
  timeout:
    description:
      - The socket level timeout in seconds
    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".
        This option is deprecated as of C(2.1) and will be removed in Ansible-2.9.
        Use I(headers) instead.
  headers:
    description:
        - Add custom HTTP headers to a request in the format of a YAML hash. As
          of C(2.3) supplying C(Content-Type) here will override the header
          generated by supplying C(json) or C(form-urlencoded) for I(body_format).
    version_added: '2.1'
  others:
    description:
      - All arguments accepted by the M(file) module also work here
  validate_certs:
    description:
      - If C(no), SSL certificates will not be validated.  This should only
        set to C(no) used on personally controlled sites using self-signed
        certificates.  Prior to 1.9.2 the code defaulted to C(no).
    type: bool
    default: 'yes'
    version_added: '1.9.2'
  client_cert:
    description:
      - PEM formatted certificate chain file to be used for SSL client
        authentication. This file can also include the key as well, and if
        the key is included, I(client_key) is not required
    version_added: '2.4'
  client_key:
    description:
      - PEM formatted file that contains your private key to be used for SSL
        client authentication. If I(client_cert) contains both the certificate
        and key, this option is not required.
    version_added: '2.4'
notes:
  - The dependency on httplib2 was removed in Ansible 2.1.
  - The module returns all the HTTP headers in lower-case.
  - For Windows targets, use the M(win_uri) module instead.
author:
- Romeo Theriault (@romeotheriault)
'''

EXAMPLES = r'''
- name: 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.
- uri:
    url: http://www.example.com
    return_content: yes
  register: this
  failed_when: "'AWESOME' not in this.content"

- name: Create a JIRA issue
  uri:
    url: https://your.jira.example.com/rest/api/2/issue/
    method: POST
    user: your_username
    password: your_pass
    body: "{{ lookup('file','issue.json') }}"
    force_basic_auth: yes
    status_code: 201
    body_format: json

# Login to a form based webpage, then use the returned cookie to
# access the app in later tasks

- uri:
    url: https://your.form.based.auth.example.com/index.php
    method: POST
    body_format: form-urlencoded
    body:
      name: your_username
      password: your_password
      enter: Sign in
    status_code: 302
  register: login

# Same, but now using a list of tuples
- uri:
    url: https://your.form.based.auth.example.com/index.php
    method: POST
    body_format: form-urlencoded
    body:
    - [ name, your_username ]
    - [ password, your_password ]
    - [ enter, Sign in ]
    status_code: 302
  register: login

- uri:
    url: https://your.form.based.auth.example.com/dashboard.php
    method: GET
    return_content: yes
    headers:
      Cookie: "{{ login.set_cookie }}"

- name: Queue build of a project in Jenkins
  uri:
    url: http://{{ jenkins.host }}/job/{{ jenkins.job }}/build?token={{ jenkins.token }}
    method: GET
    user: "{{ jenkins.user }}"
    password: "{{ jenkins.password }}"
    force_basic_auth: yes
    status_code: 201
'''

RETURN = r'''
# The return information includes all the HTTP headers in lower-case.
msg:
  description: The HTTP message from the request
  returned: always
  type: string
  sample: OK (unknown bytes)
redirected:
  description: Whether the request was redirected
  returned: always
  type: bool
  sample: false
status:
  description: The HTTP status code from the request
  returned: always
  type: int
  sample: 200
url:
  description: The actual URL used for the request
  returned: always
  type: string
  sample: https://www.ansible.com/
'''

import cgi
import datetime
import json
import os
import shutil
import tempfile
import traceback

from collections import Mapping, Sequence
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.six import iteritems, string_types
from ansible.module_utils.six.moves.urllib.parse import urlencode, urlsplit
from ansible.module_utils._text import to_native, to_text
from ansible.module_utils.urls import fetch_url, url_argument_spec

JSON_CANDIDATES = ('text', 'json', 'javascript')


def write_file(module, url, dest, content):
    # create a tempfile with some test content
    fd, tmpsrc = tempfile.mkstemp(dir=module.tmpdir)
    f = open(tmpsrc, 'wb')
    try:
        f.write(content)
    except Exception as e:
        os.remove(tmpsrc)
        module.fail_json(msg="failed to create temporary content file: %s" % to_native(e),
                         exception=traceback.format_exc())
    f.close()

    checksum_src = None
    checksum_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)
    checksum_src = module.sha1(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)
        checksum_dest = module.sha1(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 checksum_src != checksum_dest:
        try:
            shutil.copyfile(tmpsrc, dest)
        except Exception as e:
            os.remove(tmpsrc)
            module.fail_json(msg="failed to copy %s to %s: %s" % (tmpsrc, dest, to_native(e)),
                             exception=traceback.format_exc())

    os.remove(tmpsrc)


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


def absolute_location(url, location):
    """Attempts to create an absolute URL based on initial URL, and
    next URL, specifically in the case of a ``Location`` header.
    """

    if '://' in location:
        return location

    elif location.startswith('/'):
        parts = urlsplit(url)
        base = url.replace(parts[2], '')
        return '%s%s' % (base, location)

    elif not location.startswith('/'):
        base = os.path.dirname(url)
        return '%s/%s' % (base, location)

    else:
        return location


def kv_list(data):
    ''' Convert data into a list of key-value tuples '''
    if data is None:
        return None

    if isinstance(data, Sequence):
        return list(data)

    if isinstance(data, Mapping):
        return list(data.items())

    raise TypeError('cannot form-urlencode body, expect list or dict')


def form_urlencoded(body):
    ''' Convert data into a form-urlencoded string '''
    if isinstance(body, string_types):
        return body

    if isinstance(body, (Mapping, Sequence)):
        result = []
        # Turn a list of lists into a list of tupples that urlencode accepts
        for key, values in kv_list(body):
            if isinstance(values, string_types) or not isinstance(values, (Mapping, Sequence)):
                values = [values]
            for value in values:
                if value is not None:
                    result.append((to_text(key), to_text(value)))
        return urlencode(result, doseq=True)

    return body


def uri(module, url, dest, body, body_format, method, headers, socket_timeout):
    # is dest is set and is a directory, let's check if we get redirected and
    # set the filename from that url
    redirected = False
    redir_info = {}
    r = {}
    if dest is not None:
        # Stash follow_redirects, in this block we don't want to follow
        # we'll reset back to the supplied value soon
        follow_redirects = module.params['follow_redirects']
        module.params['follow_redirects'] = False
        if os.path.isdir(dest):
            # first check if we are redirected to a file download
            _, redir_info = fetch_url(module, url, data=body,
                                      headers=headers,
                                      method=method,
                                      timeout=socket_timeout)
            # if we are redirected, update the url with the location header,
            # and update dest with the new url filename
            if redir_info['status'] in (301, 302, 303, 307):
                url = redir_info['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

        # Reset follow_redirects back to the stashed value
        module.params['follow_redirects'] = follow_redirects

    resp, info = fetch_url(module, url, data=body, headers=headers,
                           method=method, timeout=socket_timeout)

    try:
        content = resp.read()
    except AttributeError:
        # there was no content, but the error read()
        # may have been stored in the info as 'body'
        content = info.pop('body', '')

    r['redirected'] = redirected or info['url'] != url
    r.update(redir_info)
    r.update(info)

    return r, content, dest


def main():
    argument_spec = url_argument_spec()
    argument_spec.update(dict(
        dest=dict(type='path'),
        url_username=dict(type='str', aliases=['user']),
        url_password=dict(type='str', aliases=['password'], no_log=True),
        body=dict(type='raw'),
        body_format=dict(type='str', default='raw', choices=['form-urlencoded', 'json', 'raw']),
        method=dict(type='str', default='GET', choices=['GET', 'POST', 'PUT', 'HEAD', 'DELETE', 'OPTIONS', 'PATCH', 'TRACE', 'CONNECT', 'REFRESH']),
        return_content=dict(type='bool', default=False),
        follow_redirects=dict(type='str', default='safe', choices=['all', 'no', 'none', 'safe', 'urllib2', 'yes']),
        creates=dict(type='path'),
        removes=dict(type='path'),
        status_code=dict(type='list', default=[200]),
        timeout=dict(type='int', default=30),
        headers=dict(type='dict', default={})
    ))

    module = AnsibleModule(
        argument_spec=argument_spec,
        # TODO: Remove check_invalid_arguments in 2.9
        check_invalid_arguments=False,
        add_file_common_args=True
    )

    url = module.params['url']
    body = module.params['body']
    body_format = module.params['body_format'].lower()
    method = module.params['method']
    dest = module.params['dest']
    return_content = module.params['return_content']
    creates = module.params['creates']
    removes = module.params['removes']
    status_code = [int(x) for x in list(module.params['status_code'])]
    socket_timeout = module.params['timeout']

    dict_headers = module.params['headers']

    if body_format == 'json':
        # Encode the body unless its a string, then assume it is pre-formatted JSON
        if not isinstance(body, string_types):
            body = json.dumps(body)
        if 'content-type' not in [header.lower() for header in dict_headers]:
            dict_headers['Content-Type'] = 'application/json'
    elif body_format == 'form-urlencoded':
        if not isinstance(body, string_types):
            try:
                body = form_urlencoded(body)
            except ValueError as e:
                module.fail_json(msg='failed to parse body as form_urlencoded: %s' % to_native(e))
        if 'content-type' not in [header.lower() for header in dict_headers]:
            dict_headers['Content-Type'] = 'application/x-www-form-urlencoded'

    # TODO: Deprecated section.  Remove in Ansible 2.9
    # Grab all the http headers. Need this hack since passing multi-values is
    # currently a bit ugly. (e.g. headers='{"Content-Type":"application/json"}')
    for key, value in iteritems(module.params):
        if key.startswith("HEADER_"):
            module.deprecate('Supplying headers via HEADER_* is deprecated. Please use `headers` to'
                             ' supply headers for the request', version='2.9')
            skey = key.replace("HEADER_", "")
            dict_headers[skey] = value
    # End deprecated section

    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.
        if os.path.exists(creates):
            module.exit_json(stdout="skipped, since '%s' exists" % creates, changed=False, rc=0)

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

    # Make the request
    resp, content, dest = uri(module, url, dest, body, body_format, method,
                              dict_headers, socket_timeout)
    resp['status'] = int(resp['status'])

    # Write the file out if requested
    if dest is not None:
        if resp['status'] == 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_fs_attributes_if_different(file_args, changed)
        resp['path'] = dest
    else:
        changed = False

    # Transmogrify the headers, replacing '-' with '_', since variables don't
    # work with dashes.
    # In python3, the headers are title cased.  Lowercase them to be
    # compatible with the python2 behaviour.
    uresp = {}
    for key, value in iteritems(resp):
        ukey = key.replace("-", "_").lower()
        uresp[ukey] = value

    try:
        uresp['location'] = absolute_location(url, uresp['location'])
    except KeyError:
        pass

    # Default content_encoding to try
    content_encoding = 'utf-8'
    if 'content_type' in uresp:
        content_type, params = cgi.parse_header(uresp['content_type'])
        if 'charset' in params:
            content_encoding = params['charset']
        u_content = to_text(content, encoding=content_encoding)
        if any(candidate in content_type for candidate in JSON_CANDIDATES):
            try:
                js = json.loads(u_content)
                uresp['json'] = js
            except:
                pass
    else:
        u_content = to_text(content, encoding=content_encoding)

    if resp['status'] not in status_code:
        uresp['msg'] = 'Status code was %s and not %s: %s' % (resp['status'], status_code, uresp.get('msg', ''))
        module.fail_json(content=u_content, **uresp)
    elif return_content:
        module.exit_json(changed=changed, content=u_content, **uresp)
    else:
        module.exit_json(changed=changed, **uresp)


if __name__ == '__main__':
    main()
