author | Nishanth Amuluru <nishanth@fossee.in> |
Sun, 09 Jan 2011 11:13:36 +0530 | |
changeset 114 | 1a88b04adb39 |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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# hgweb/common.py - Utility functions needed by hgweb_mod and hgwebdir_mod |
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# |
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# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> |
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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|
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import errno, mimetypes, os |
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|
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HTTP_OK = 200 |
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HTTP_NOT_MODIFIED = 304 |
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HTTP_BAD_REQUEST = 400 |
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HTTP_UNAUTHORIZED = 401 |
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HTTP_FORBIDDEN = 403 |
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HTTP_NOT_FOUND = 404 |
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HTTP_METHOD_NOT_ALLOWED = 405 |
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HTTP_SERVER_ERROR = 500 |
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|
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# Hooks for hgweb permission checks; extensions can add hooks here. Each hook |
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# is invoked like this: hook(hgweb, request, operation), where operation is |
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# either read, pull or push. Hooks should either raise an ErrorResponse |
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# exception, or just return. |
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# It is possible to do both authentication and authorization through this. |
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permhooks = [] |
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def checkauthz(hgweb, req, op): |
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'''Check permission for operation based on request data (including |
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authentication info). Return if op allowed, else raise an ErrorResponse |
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exception.''' |
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user = req.env.get('REMOTE_USER') |
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deny_read = hgweb.configlist('web', 'deny_read') |
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if deny_read and (not user or deny_read == ['*'] or user in deny_read): |
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raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized') |
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allow_read = hgweb.configlist('web', 'allow_read') |
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result = (not allow_read) or (allow_read == ['*']) |
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if not (result or user in allow_read): |
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raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized') |
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if op == 'pull' and not hgweb.allowpull: |
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raise ErrorResponse(HTTP_UNAUTHORIZED, 'pull not authorized') |
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elif op == 'pull' or op is None: # op is None for interface requests |
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return |
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# enforce that you can only push using POST requests |
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if req.env['REQUEST_METHOD'] != 'POST': |
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msg = 'push requires POST request' |
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raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg) |
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# require ssl by default for pushing, auth info cannot be sniffed |
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# and replayed |
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scheme = req.env.get('wsgi.url_scheme') |
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if hgweb.configbool('web', 'push_ssl', True) and scheme != 'https': |
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raise ErrorResponse(HTTP_OK, 'ssl required') |
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deny = hgweb.configlist('web', 'deny_push') |
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if deny and (not user or deny == ['*'] or user in deny): |
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raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized') |
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allow = hgweb.configlist('web', 'allow_push') |
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result = allow and (allow == ['*'] or user in allow) |
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if not result: |
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raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized') |
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# Add the default permhook, which provides simple authorization. |
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permhooks.append(checkauthz) |
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class ErrorResponse(Exception): |
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def __init__(self, code, message=None, headers=[]): |
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Exception.__init__(self) |
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self.code = code |
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self.headers = headers |
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if message is not None: |
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self.message = message |
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else: |
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self.message = _statusmessage(code) |
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def _statusmessage(code): |
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from BaseHTTPServer import BaseHTTPRequestHandler |
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responses = BaseHTTPRequestHandler.responses |
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return responses.get(code, ('Error', 'Unknown error'))[0] |
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def statusmessage(code, message=None): |
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return '%d %s' % (code, message or _statusmessage(code)) |
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def get_mtime(spath): |
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cl_path = os.path.join(spath, "00changelog.i") |
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if os.path.exists(cl_path): |
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return os.stat(cl_path).st_mtime |
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else: |
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return os.stat(spath).st_mtime |
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def staticfile(directory, fname, req): |
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"""return a file inside directory with guessed Content-Type header |
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fname always uses '/' as directory separator and isn't allowed to |
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contain unusual path components. |
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Content-Type is guessed using the mimetypes module. |
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Return an empty string if fname is illegal or file not found. |
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|
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""" |
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parts = fname.split('/') |
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for part in parts: |
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if (part in ('', os.curdir, os.pardir) or |
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os.sep in part or os.altsep is not None and os.altsep in part): |
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return "" |
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fpath = os.path.join(*parts) |
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if isinstance(directory, str): |
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directory = [directory] |
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for d in directory: |
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115 |
path = os.path.join(d, fpath) |
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116 |
if os.path.exists(path): |
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117 |
break |
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118 |
try: |
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119 |
os.stat(path) |
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120 |
ct = mimetypes.guess_type(path)[0] or "text/plain" |
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121 |
req.respond(HTTP_OK, ct, length = os.path.getsize(path)) |
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122 |
return open(path, 'rb').read() |
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123 |
except TypeError: |
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124 |
raise ErrorResponse(HTTP_SERVER_ERROR, 'illegal filename') |
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125 |
except OSError, err: |
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126 |
if err.errno == errno.ENOENT: |
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127 |
raise ErrorResponse(HTTP_NOT_FOUND) |
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128 |
else: |
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129 |
raise ErrorResponse(HTTP_SERVER_ERROR, err.strerror) |
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130 |
|
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131 |
def paritygen(stripecount, offset=0): |
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132 |
"""count parity of horizontal stripes for easier reading""" |
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133 |
if stripecount and offset: |
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134 |
# account for offset, e.g. due to building the list in reverse |
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135 |
count = (stripecount + offset) % stripecount |
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136 |
parity = (stripecount + offset) / stripecount & 1 |
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137 |
else: |
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138 |
count = 0 |
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139 |
parity = 0 |
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140 |
while True: |
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141 |
yield parity |
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142 |
count += 1 |
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143 |
if stripecount and count >= stripecount: |
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144 |
parity = 1 - parity |
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145 |
count = 0 |
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146 |
|
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147 |
def get_contact(config): |
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148 |
"""Return repo contact information or empty string. |
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149 |
|
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150 |
web.contact is the primary source, but if that is not set, try |
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151 |
ui.username or $EMAIL as a fallback to display something useful. |
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152 |
""" |
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153 |
return (config("web", "contact") or |
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154 |
config("ui", "username") or |
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155 |
os.environ.get("EMAIL") or "") |
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156 |
|
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157 |
def caching(web, req): |
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158 |
tag = str(web.mtime) |
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159 |
if req.env.get('HTTP_IF_NONE_MATCH') == tag: |
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160 |
raise ErrorResponse(HTTP_NOT_MODIFIED) |
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161 |
req.headers.append(('ETag', tag)) |