File ahttp.py artifact 70322b0ca9 part of check-in 4caf8247dc

#
# encoding: UTF-8
# api: streamtuner2
# type: functions
# title: http download / methods
# description: http utility
# version: 1.5
#
# Utility code for HTTP requests, used by all channel plugins.
#
# Provides a http "GET" method, but also does POST and AJAX-
# simulating requests too. Hooks into mains gtk.statusbar().
# And can normalize URLs to always carry a trailing slash
# after the domain name.


from config import *
import requests, platform

#-- extra debugging, http://stackoverflow.com/questions/10588644/how-can-i-see-the-entire-http-request-thats-being-sent-by-my-python-application
if conf.debug >= 2:
    import logging
    import httplib
    httplib.HTTPConnection.debuglevel = 1
    logging.basicConfig() 
    logging.getLogger().setLevel(logging.DEBUG)
    requests_log = logging.getLogger("requests.packages.urllib3")
    requests_log.setLevel(logging.DEBUG)
    requests_log.propagate = True

#-- ssl
try:
    import certifi
    ca_certs = certifi.where()
except Exception as e:
    log.WARN("No SSL support. Try `sudo pip install urllib3[secure] certifi`", e)
    ca_certs = False
    from requests.packages.urllib3.exceptions import InsecureRequestWarning
    requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

#-- hooks to progress meter and status bar in main window
feedback = None

# Sets either text or percentage of main windows' status bar.
#
# Can either take a float parameter (e.g. 0.99 for % indicator)
# or text message. Alternatively two parameters to update both.
def progress_feedback(*args, **kwargs):

  # use reset values if none given
  if not args:
     args = ["", 1.0]
  timeout = kwargs.get("timeout", 50)

  # send to main win
  if feedback:
    try: [feedback(d, timeout=timeout) for d in args]
    except: pass

#-- more detailed U-A string
def user_agent():
    desc = {"Darwin":"MacOS", "Windows":"NT", "Linux":"X11"}.get(platform.system(), "X11")
    return "streamtuner2/{} ({}; {} {}; Python/{}; rv:{}) like WinAmp/2.1".format(
        conf.version, desc, platform.system(), platform.machine(), platform.python_version(), "72.0"
    )

# prepare default query object
session = requests.Session()
#if ca_certs:
#    session.certs = certifi
#log.SESS(session.__dict__)
# default HTTP headers for requests
session.headers.update({
    "User-Agent": user_agent(),
    "Accept": "*/*",
    "Accept-Language": "en-US,en,de,es,fr,it,*;q=0.1",
    "Accept-Encoding": "gzip, deflate",
    "Accept-Charset": "UTF-8, ISO-8859-1;q=0.5, *;q=0.1",
})


#-- Retrieve data via HTTP
#
#  Well, it says "get", but it actually does POST and AJAXish GET requests too.
#
def get(
       url, params={}, referer=None, post=0, ajax=0, json=0,
       binary=0, content=True, encoding=None, verify=False,
       statusmsg=None, timeout=9.25, quieter=0, add_headers={}
    ):

    # statusbar info
    if not quieter:
        progress_feedback(url, timeout=timeout/1.5)
    
    # combine headers
    headers = {}
    headers.update(add_headers)
    if ajax:
        headers["X-Requested-With"] = "XMLHttpRequest"
    if referer:
        headers["Referer"] = (referer if referer not in [True, 1] else url)

#ifdef BLD_DEBUG
#srcout    raise Exception("Simulated HTTP error")
#endif
    
    # read
    if post:
        log.HTTP("POST", url, params)
        if json:
            r = session.post(url, json=params, headers=headers, timeout=timeout)
        else:
            r = session.post(url, data=params, headers=headers, timeout=timeout)
    else:    
        log.HTTP("GET"+(" AJAX" if ajax else ""), url, params )
        r = session.get(url, params=params, headers=headers, verify=verify, timeout=timeout)

    if not quieter:
        log.HTTP(">>>", r.request.headers );
        log.HTTP("<<<", r.headers );
    
    # err?
    if r.status_code != 200:
        log.ERR("HTTP Status", r.status_code, r.reason)
        log.INFO(r.content)
        progress_feedback("No data received ({} - {}) from channel".format(r.status_code, r.reason))
        return ""
    # result
    log.INFO("Status", r.status_code )
    log.INFO("Content-Length", len(r.content) )
    statusmsg and progress_feedback(statusmsg)
    if not content:
        return r
    elif binary:
        r = r.content
    else:
        # Manually decode charset
        if encoding:
            r.encoding = encoding
            r = r.content.decode(encoding, errors='replace')
        # See requests isse #2359, automatic charset detection can be awfully slow
        else:
            r = r.text
    # clean statusbar
    statusmsg and progress_feedback()
    return r


#-- Append missing trailing slash to URLs
def fix_url(url):
    if url is None:
        url = ""
    if len(url):
        # remove whitespace
        url = url.strip()
        # add scheme
        if (url.find("://") < 0):
            url = "http://" + url
        # add mandatory path
        if (url.find("/", 10) < 0):
            url = url + "/"
    return url