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#!/usr/bin/env python2.4

import tarfile
import zipfile
import os
import sys
import datetime

try:
    # FIXME: this does not work
    import hashlib
    md5_cons = hashlib.md5
    sha1_cons = hashlib.sha1
except:
    import md5
    import sha
    md5_cons = md5.new
    sha1_cons = sha.new


def hash_file(fileobj, *hashobjects):
    """ RAM efficient hashing implementation for stream-based file objects. """
    data = fileobj.read(1024*1024)
    while data:
        for ho in hashobjects:
            ho.update(data)
        data = fileobj.read(1024*1024)

    return (ho.hexdigest() for ho in hashobjects)


class ArchiveInfo:
    def __init__(self, filename, url, ebuild):
        self.filename = filename
        self.filesize = os.path.getsize(filename) # this can throw an exception
        self.mtime = os.path.getmtime(filename)
        self.basename = os.path.basename(filename)
        self.ebuild = ebuild
        self.url = url


    def write_info(self, outfiledir):
        outfilename = ""
        try:
            (fnum, outfilename) = self.make_outfile(outfiledir)
            self.out_fd = open(outfilename, "w")
            self.write_header()
            self.write_content()
            self.out_fd.close()
            return outfilename
        except:
            if outfilename:
                os.remove(outfilename)
            raise

    def write_header(self):
        self.out_fd.write("File-dist-name: %s\n" % (self.basename))
        self.out_fd.write("File-dist-size: %s\n" % (self.filesize))
        self.out_fd.write("File-dist-present: True\n")
        self.out_fd.write("File-dist-origin: %s\n" % (self.url))
        #self.out_fd.write("File-dist-ebuild: %s\n" % (self.ebuild))
        self.out_fd.write("File-dist-mtime: %s\n" %(self.mtime))
        
        distfile = open(self.filename)
        (md5, sha1) = hash_file(distfile, md5_cons(), sha1_cons())
        self.out_fd.write("File-dist-md5: %s\n" % (md5))
        self.out_fd.write("File-dist-sha1: %s\n" % (sha1))
        distfile.close()

    def make_outfile(self, tdir):
        import tempfile
        outfdname = tempfile.mkstemp(prefix=self.basename, dir=tdir)
        return outfdname

class TarInfo(ArchiveInfo):
    def write_content(self):
        tar = tarfile.TarFile.open(self.filename, 'r')
        
        file_info = tar.next()
        filecount = 0
        while file_info != None:
            if file_info.isfile():
                file_stream = tar.extractfile(file_info)
                
                if file_stream == None:
                    print "Filestream empty on %s" % (file_info.name)
                    pass
                else:
                    self.out_fd.write("File-%05d-name: %s\n" %(filecount, file_info.name))
                    self.out_fd.write("File-%05d-size: %s\n" %(filecount, file_info.size))
                    self.out_fd.write("File-%05d-mtime: %s\n" %(filecount, file_info.mtime))
                    (md5, sha1) = hash_file(file_stream, md5_cons(), sha1_cons())
                    self.out_fd.write("File-%05d-md5: %s\n" %(filecount, md5))
                    self.out_fd.write("File-%05d-sha1: %s\n" %(filecount, sha1))
                    filecount += 1
            file_info = tar.next()
        tar.close()

class ZipInfo(ArchiveInfo):
    def write_content(self):
        zip = zipfile.ZipFile(self.filename, 'r')

        filecount = 0
        for name in zip.namelist():
            file_info = zip.getinfo(name)
            if os.path.basename(file_info.filename) == "":
                # this is a directory
                continue
            file_content = zip.read(name) # Doesn't work stream based :-/
            file_time = datetime.datetime(*file_info.date_time)
            self.out_fd.write("File-%05d-name: %s\n" %(filecount, file_info.filename))
            self.out_fd.write("File-%05d-size: %s\n" %(filecount, file_info.file_size))
            self.out_fd.write("File-%05d-mtime: %s\n" %(filecount, file_time.strftime("%s")))

            md5 = md5_cons(file_content).hexdigest()
            sha1 = sha1_cons(file_content).hexdigest()
            self.out_fd.write("File-%05d-md5: %s\n" %(filecount, md5))
            self.out_fd.write("File-%05d-sha1: %s\n" %(filecount, sha1))

            filecount += 1

        zip.close()




def main():
    import getopt
    try:
        optlist, list = getopt.getopt(sys.argv[1:],
                                  'f:P:hu:')
    except getopt.GetoptError:
        usage(sys.argv[0])
        sys.exit(2)

    infilename = None
    outdir = "."
    url = None
    for opt, arg in optlist:
        if opt == '-h':
            usage(sys.argv[0])
            sys.exit(0)
        if opt == '-f':
            infilename = arg
        if opt == '-P':
            outdir = arg
        if opt == '-u':
            url = arg

    if not infilename:
        print "Please specify a filename."
    else:
        tar_finished = False
        try:
            t = TarInfo(infilename, url, None)
            filename = t.write_info(outdir)
            tar_finished = True
        except:
            pass
        if tar_finished:
            sys.exit(0)
        try:
            t = ZipInfo(infilename, url, None)
            filename = t.write_info(outdir)
        except:
            print infilename, " could not be opened"

def usage(programname):
    """ Print usage information """
    print "Usage: %s [-h] [-P <dir>] [-f <file>] [-u <url>]" % (programname)
    print '''
This script opens the file specified by -f, and writes the index to the directory specified by -P.

Parameters:
 -h        Display this help
 -f file   Path to the file to index, must be present
 -P path   Directory to create the index file in (default: .)
 -u url    URL to record inside the index
'''


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print '\n ! Exiting.'