mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-26 02:10:59 +00:00
refactor modify addons
Use a universal ModifySpec class to represent rules. ModifyHeaders now supports reading the header value from a file.
This commit is contained in:
Martin Plattner
parent
2ed7770716
commit
2a408c9379
@ -48,19 +48,19 @@ The `modify_body` option lets you specify an arbitrary number of patterns that
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define replacements within bodies of flows. A replacement pattern looks like this:
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{{< highlight none >}}
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[/patt]/regex/replacement
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[/flow-filter]/regex/replacement
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{{< / highlight >}}
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Here, **patt** is a mitmproxy [filter expression]({{< relref "concepts-filters">}})
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Here, **flow-filter** is an optional mitmproxy [filter expression]({{< relref "concepts-filters">}})
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that defines which flows a replacement applies to, **regex** is a valid Python
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regular expression that defines what gets replaced, and **replacement** is a string
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literal that is substituted in. The separator is arbitrary, and defined by the
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first character. If the replacement string literal starts with `@`, it is treated
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as a file path from which the replacement is read.
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Replace hooks fire when either a client request or a server response is
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Modify hooks fire when either a client request or a server response is
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received. Only the matching flow component is affected: so, for example,
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if a replace hook is triggered on server response, the replacement is
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if a modify hook is triggered on server response, the replacement is
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only run on the Response object leaving the Request intact. You control
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whether the hook triggers on the request, response or both using the
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filter pattern. If you need finer-grained control than this, it's simple
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@ -88,16 +88,17 @@ New headers can be added, and existing headers can be overwritten or removed.
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A `modify_headers` expression looks like this:
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{{< highlight none >}}
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[/patt]/name/value
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[/flow-filter]/name/value
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{{< / highlight >}}
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Here, **patt** is a mitmproxy [filter expression]({{< relref "concepts-filters">}})
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Here, **flow-filter** is an optional mitmproxy [filter expression]({{< relref "concepts-filters">}})
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that defines which flows to modify headers on, e.g., only on responses using ``~s``.
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The parameters **name** and **value** are the header name and the value to set
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respectively, e.g., ``/Host/example.org``. An empty **value** removes existing
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headers with **name**, e.g., ``/Host/``. Existing headers are overwritten by
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default. This can be changed using filter-expressions, e.g., ``!~h Host:`` to
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ignore requests and responses with an existing ``Host`` header.
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headers with **name**, e.g., ``/Host/``. If **value** starts with `@`, it is treated
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as a file path from which the header value is read. Existing headers are overwritten
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by default. This can be changed using a filter expression, e.g., the filter
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``!~h Host:`` ignores requests and responses with an existing ``Host`` header.
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## Proxy Authentication
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@ -3,14 +3,13 @@ import re
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import typing
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from mitmproxy import exceptions
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from mitmproxy import flowfilter
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from mitmproxy import ctx
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from mitmproxy.addons.modifyheaders import parse_modify_hook
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from mitmproxy.addons.modifyheaders import parse_modify_spec, ModifySpec
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class ModifyBody:
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def __init__(self):
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self.lst = []
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self.replacements: typing.List[ModifySpec] = []
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def load(self, loader):
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loader.add_option(
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@ -23,62 +22,42 @@ class ModifyBody:
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)
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def configure(self, updated):
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"""
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.modify_body is a list of tuples (flow_filter_pattern, regex, repl):
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flow_filter_pattern: a string specifying a flow filter pattern.
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regex: a regular expression, as string.
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repl: the replacement string
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"""
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if "modify_body" in updated:
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lst = []
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for rep in ctx.options.modify_body:
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self.replacements = []
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for option in ctx.options.modify_body:
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try:
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flow_filter_pattern, regex, repl = parse_modify_hook(rep)
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spec = parse_modify_spec(option)
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try:
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# We should ideally escape here before trying to compile
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re.compile(spec.subject)
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except re.error:
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raise ValueError(f"Invalid regular expression: {spec.subject}")
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except ValueError as e:
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raise exceptions.OptionsError(
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"Invalid modify_body option: %s" % rep
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f"Cannot parse modify_body option {option}: {e}"
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) from e
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flow_filter = flowfilter.parse(flow_filter_pattern)
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if not flow_filter:
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raise exceptions.OptionsError(
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"Invalid modify_body flow filter: %s" % flow_filter_pattern
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)
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try:
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# We should ideally escape here before trying to compile
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re.compile(regex)
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except re.error as e:
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raise exceptions.OptionsError(
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"Invalid regular expression: %s - %s" % (regex, str(e))
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)
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if repl.startswith(b"@") and not os.path.isfile(repl[1:]):
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raise exceptions.OptionsError(
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"Invalid file path: {}".format(repl[1:])
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)
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lst.append((regex, repl, flow_filter))
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self.lst = lst
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self.replacements.append(spec)
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def execute(self, f):
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for regex, repl, flow_filter in self.lst:
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if flow_filter(f):
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if f.response:
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self.replace(f.response, regex, repl)
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def run(self, flow):
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for spec in self.replacements:
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if spec.matches(flow):
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if flow.response:
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self.replace(flow.response, spec.subject, spec.replacement)
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else:
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self.replace(f.request, regex, repl)
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self.replace(flow.request, spec.subject, spec.replacement)
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def request(self, flow):
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if not flow.reply.has_message:
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self.execute(flow)
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self.run(flow)
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def response(self, flow):
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if not flow.reply.has_message:
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self.execute(flow)
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self.run(flow)
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def replace(self, obj, search, repl):
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"""
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Replaces a regular expression pattern with repl in the body of the message.
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Encoded body will be decoded before replacement, and re-encoded afterwards.
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Replaces all matches of the regex search in the body of the message with repl.
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Returns:
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The number of replacements made.
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@ -1,3 +1,4 @@
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import os
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import typing
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from mitmproxy import exceptions
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@ -6,87 +7,116 @@ from mitmproxy.utils import strutils
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from mitmproxy import ctx
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def parse_modify_hook(s):
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class ModifySpec(typing.NamedTuple):
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"""
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Returns a (flow_filter, header_name, header_value) tuple.
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match_str: a string specifying a flow filter pattern.
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matches: the parsed match_str as a flowfilter.TFilter object
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subject: a header name for ModifyHeaders and a regex pattern for ModifyBody
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replacement: the replacement string
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"""
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match_str: str
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matches: flowfilter.TFilter
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subject: bytes
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replacement: bytes
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The general form for a modify_headers hook is as follows:
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[/flow_filter]/header_name/header_value
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def parse_modify_spec(option) -> ModifySpec:
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"""
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The form for the modify_* options is as follows:
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* modify_headers: [/flow-filter]/header-name/[@]header-value
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* modify_body: [/flow-filter]/search-regex/[@]replace
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The @ allows to provide a file path that is used to read the respective option.
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Both ModifyHeaders and ModifyBody use ModifySpec to represent a single rule.
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The first character specifies the separator. Example:
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:~q:foo:bar
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If only two clauses are specified, the pattern is set to match
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universally (i.e. ".*"). Example:
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If only two clauses are specified, the flow filter is set to
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match universally (i.e. ".*"). Example:
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/foo/bar
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Clauses are parsed from left to right. Extra separators are taken to be
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part of the final clause. For instance, the replacement clause below is
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"foo/bar/":
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part of the final clause. For instance, the last parameter (header-value or
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replace) below is "foo/bar/":
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/one/two/foo/bar/
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"""
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sep, rem = s[0], s[1:]
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sep, rem = option[0], option[1:]
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parts = rem.split(sep, 2)
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if len(parts) == 2:
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flow_filter = ".*"
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header_name, header_value = parts
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flow_filter_pattern = ".*"
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subject, replacement = parts
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elif len(parts) == 3:
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flow_filter, header_name, header_value = parts
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flow_filter_pattern, subject, replacement = parts
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else:
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raise ValueError(
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"Invalid modify_* specifier: %s" % s
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)
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raise ValueError(f"Invalid number of parameters (2 or 3 are expected)")
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if isinstance(header_name, str):
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header_name = strutils.escaped_str_to_bytes(header_name)
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if isinstance(header_value, str):
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header_value = strutils.escaped_str_to_bytes(header_value)
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flow_filter = flowfilter.parse(flow_filter_pattern)
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if not flow_filter:
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raise ValueError(f"Invalid filter pattern: {flow_filter_pattern}")
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return flow_filter, header_name, header_value
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if isinstance(subject, str):
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subject = strutils.escaped_str_to_bytes(subject)
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if isinstance(replacement, str):
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replacement = strutils.escaped_str_to_bytes(replacement)
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if replacement.startswith(b"@") and not os.path.isfile(replacement[1:]):
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raise ValueError(f"Invalid file path: {replacement[1:]}")
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return ModifySpec(flow_filter_pattern, flow_filter, subject, replacement)
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class ModifyHeaders:
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def __init__(self):
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self.lst = []
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self.replacements: typing.List[ModifySpec] = []
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def load(self, loader):
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loader.add_option(
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"modify_headers", typing.Sequence[str], [],
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"""
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Header modify pattern of the form "[/flow-filter]/header-name/header-value", where the
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separator can be any character. An empty header-value removes existing header-name headers.
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Header modify pattern of the form "[/flow-filter]/header-name/[@]header-value", where the
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separator can be any character. The @ allows to provide a file path that is used to read
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the header value string. An empty header-value removes existing header-name headers.
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"""
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)
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def configure(self, updated):
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self.replacements = []
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if "modify_headers" in updated:
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self.lst = []
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for shead in ctx.options.modify_headers:
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for option in ctx.options.modify_headers:
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try:
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flow_filter_pattern, header, value = parse_modify_hook(shead)
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spec = parse_modify_spec(option)
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except ValueError as e:
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raise exceptions.OptionsError(
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"Invalid modify_headers option: %s" % shead
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f"Cannot parse modify_headers option {option}: {e}"
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) from e
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self.replacements.append(spec)
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flow_filter = flowfilter.parse(flow_filter_pattern)
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if not flow_filter:
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raise exceptions.OptionsError(
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"Invalid modify_headers flow filter %s" % flow_filter_pattern
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)
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self.lst.append((flow_filter_pattern, flow_filter, header, value))
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def run(self, flow, hdrs):
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# unset all specified headers
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for spec in self.replacements:
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if spec.matches(flow):
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hdrs.pop(spec.subject, None)
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def run(self, f, hdrs):
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for _, flow_filter, header, value in self.lst:
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if flow_filter(f):
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hdrs.pop(header, None)
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for _, flow_filter, header, value in self.lst:
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if flow_filter(f) and value:
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hdrs.add(header, value)
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# set all specified headers if the replacement string is not empty
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for spec in self.replacements:
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if spec.replacement.startswith(b"@"):
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path = os.path.expanduser(spec.replacement[1:])
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try:
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with open(path, "rb") as file:
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replacement = file.read()
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except IOError:
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ctx.log.warn(f"Could not read replacement file {path}")
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return
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else:
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replacement = spec.replacement
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if spec.matches(flow) and replacement:
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hdrs.add(spec.subject, replacement)
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def request(self, flow):
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if not flow.reply.has_message:
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@ -1,31 +1,37 @@
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import pytest
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from mitmproxy.addons import modifybody
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from mitmproxy.addons.modifyheaders import parse_modify_hook
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from mitmproxy.addons.modifyheaders import parse_modify_spec
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from mitmproxy.test import taddons
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from mitmproxy.test import tflow
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class TestModifyBody:
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def test_parse_modify_hook(self):
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x = parse_modify_hook("/foo/bar/voing")
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assert x == ("foo", b"bar", b"voing")
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x = parse_modify_hook("/foo/bar/vo/ing/")
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assert x == ("foo", b"bar", b"vo/ing/")
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x = parse_modify_hook("/bar/voing")
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assert x == (".*", b"bar", b"voing")
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with pytest.raises(Exception, match="Invalid modify_\\* specifier"):
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parse_modify_hook("/")
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def test_parse_modify_spec(self):
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x = parse_modify_spec("/foo/bar/voing")
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assert [x[0], x[2], x[3]] == ["foo", b"bar", b"voing"]
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x = parse_modify_spec("/foo/bar/vo/ing/")
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assert [x[0], x[2], x[3]] == ["foo", b"bar", b"vo/ing/"]
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x = parse_modify_spec("/bar/voing")
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assert [x[0], x[2], x[3]] == [".*", b"bar", b"voing"]
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with pytest.raises(Exception, match="Invalid number of parameters"):
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parse_modify_spec("/")
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with pytest.raises(Exception, match="Invalid filter pattern"):
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parse_modify_spec("/~b/one/two")
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def test_configure(self):
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mb = modifybody.ModifyBody()
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with taddons.context(mb) as tctx:
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tctx.configure(mb, modify_body=["one/two/three"])
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with pytest.raises(Exception, match="Invalid modify_body option"):
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with pytest.raises(Exception, match="Cannot parse modify_body .* Invalid number"):
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tctx.configure(mb, modify_body = ["/"])
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with pytest.raises(Exception, match="Invalid modify_body flow filter"):
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with pytest.raises(Exception, match="Cannot parse modify_body .* Invalid filter"):
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tctx.configure(mb, modify_body=["/~b/two/three"])
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with pytest.raises(Exception, match="Invalid regular expression"):
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with pytest.raises(Exception, match="Cannot parse modify_body .* Invalid regular expression"):
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tctx.configure(mb, modify_body=["/foo/+/three"])
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tctx.configure(mb, modify_body=["/a/b/c/"])
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@ -7,30 +7,44 @@ from mitmproxy.addons import modifyheaders
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class TestModifyHeaders:
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def test_parse_modify_hook(self):
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x = modifyheaders.parse_modify_hook("/foo/bar/voing")
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assert x == ("foo", b"bar", b"voing")
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x = modifyheaders.parse_modify_hook("/foo/bar/vo/ing/")
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assert x == ("foo", b"bar", b"vo/ing/")
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x = modifyheaders.parse_modify_hook("/bar/voing")
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assert x == (".*", b"bar", b"voing")
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with pytest.raises(Exception, match="Invalid modify_\\* specifier"):
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modifyheaders.parse_modify_hook("/")
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def test_parse_modify_spec(self):
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x = modifyheaders.parse_modify_spec("/foo/bar/voing")
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assert [x[0], x[2], x[3]] == ["foo", b"bar", b"voing"]
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x = modifyheaders.parse_modify_spec("/foo/bar/vo/ing/")
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assert [x[0], x[2], x[3]] == ["foo", b"bar", b"vo/ing/"]
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x = modifyheaders.parse_modify_spec("/bar/voing")
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assert [x[0], x[2], x[3]] == [".*", b"bar", b"voing"]
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with pytest.raises(Exception, match="Invalid number of parameters"):
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modifyheaders.parse_modify_spec("/")
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with pytest.raises(Exception, match="Invalid filter pattern"):
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modifyheaders.parse_modify_spec("/~b/one/two")
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with pytest.raises(Exception, match="Invalid file path"):
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modifyheaders.parse_modify_spec("/~q/foo/@nonexistent")
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def test_configure(self):
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sh = modifyheaders.ModifyHeaders()
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with taddons.context(sh) as tctx:
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with pytest.raises(Exception, match="Invalid modify_headers option"):
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tctx.configure(sh, modify_headers = ["/"])
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with pytest.raises(Exception, match="Invalid modify_headers flow filter"):
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tctx.configure(sh, modify_headers = ["/~b/one/two"])
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tctx.configure(sh, modify_headers = ["/foo/bar/voing"])
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mh = modifyheaders.ModifyHeaders()
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with taddons.context(mh) as tctx:
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with pytest.raises(Exception, match="Cannot parse modify_headers .* Invalid number"):
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tctx.configure(mh, modify_headers = ["/"])
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with pytest.raises(Exception, match="Cannot parse modify_headers .* Invalid filter"):
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tctx.configure(mh, modify_headers = ["/~b/one/two"])
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with pytest.raises(Exception, match="Cannot parse modify_headers .* Invalid file"):
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tctx.configure(mh, modify_headers = ["/~q/foo/@nonexistent"])
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tctx.configure(mh, modify_headers = ["/foo/bar/voing"])
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def test_modify_headers(self):
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sh = modifyheaders.ModifyHeaders()
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with taddons.context(sh) as tctx:
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mh = modifyheaders.ModifyHeaders()
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with taddons.context(mh) as tctx:
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tctx.configure(
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sh,
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mh,
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modify_headers = [
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"/~q/one/two",
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"/~s/one/three"
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@ -38,16 +52,16 @@ class TestModifyHeaders:
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)
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f = tflow.tflow()
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f.request.headers["one"] = "xxx"
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sh.request(f)
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||||
mh.request(f)
|
||||
assert f.request.headers["one"] == "two"
|
||||
|
||||
f = tflow.tflow(resp=True)
|
||||
f.response.headers["one"] = "xxx"
|
||||
sh.response(f)
|
||||
mh.response(f)
|
||||
assert f.response.headers["one"] == "three"
|
||||
|
||||
tctx.configure(
|
||||
sh,
|
||||
mh,
|
||||
modify_headers = [
|
||||
"/~s/one/two",
|
||||
"/~s/one/three"
|
||||
@ -56,11 +70,11 @@ class TestModifyHeaders:
|
||||
f = tflow.tflow(resp=True)
|
||||
f.request.headers["one"] = "xxx"
|
||||
f.response.headers["one"] = "xxx"
|
||||
sh.response(f)
|
||||
mh.response(f)
|
||||
assert f.response.headers.get_all("one") == ["two", "three"]
|
||||
|
||||
tctx.configure(
|
||||
sh,
|
||||
mh,
|
||||
modify_headers = [
|
||||
"/~q/one/two",
|
||||
"/~q/one/three"
|
||||
@ -68,12 +82,12 @@ class TestModifyHeaders:
|
||||
)
|
||||
f = tflow.tflow()
|
||||
f.request.headers["one"] = "xxx"
|
||||
sh.request(f)
|
||||
mh.request(f)
|
||||
assert f.request.headers.get_all("one") == ["two", "three"]
|
||||
|
||||
# test removal of existing headers
|
||||
tctx.configure(
|
||||
sh,
|
||||
mh,
|
||||
modify_headers = [
|
||||
"/~q/one/",
|
||||
"/~s/one/"
|
||||
@ -81,26 +95,64 @@ class TestModifyHeaders:
|
||||
)
|
||||
f = tflow.tflow()
|
||||
f.request.headers["one"] = "xxx"
|
||||
sh.request(f)
|
||||
mh.request(f)
|
||||
assert "one" not in f.request.headers
|
||||
|
||||
f = tflow.tflow(resp=True)
|
||||
f.response.headers["one"] = "xxx"
|
||||
sh.response(f)
|
||||
mh.response(f)
|
||||
assert "one" not in f.response.headers
|
||||
|
||||
tctx.configure(
|
||||
sh,
|
||||
mh,
|
||||
modify_headers = [
|
||||
"/one/"
|
||||
]
|
||||
)
|
||||
f = tflow.tflow()
|
||||
f.request.headers["one"] = "xxx"
|
||||
sh.request(f)
|
||||
mh.request(f)
|
||||
assert "one" not in f.request.headers
|
||||
|
||||
f = tflow.tflow(resp=True)
|
||||
f.response.headers["one"] = "xxx"
|
||||
sh.response(f)
|
||||
mh.response(f)
|
||||
assert "one" not in f.response.headers
|
||||
|
||||
|
||||
class TestModifyHeadersFile:
|
||||
def test_simple(self, tmpdir):
|
||||
mh = modifyheaders.ModifyHeaders()
|
||||
with taddons.context(mh) as tctx:
|
||||
tmpfile = tmpdir.join("replacement")
|
||||
tmpfile.write("two")
|
||||
tctx.configure(
|
||||
mh,
|
||||
modify_headers=["/~q/one/@" + str(tmpfile)]
|
||||
)
|
||||
f = tflow.tflow()
|
||||
f.request.headers["one"] = "xxx"
|
||||
mh.request(f)
|
||||
assert f.request.headers["one"] == "two"
|
||||
|
||||
@pytest.mark.asyncio
|
||||
async def test_nonexistent(self, tmpdir):
|
||||
mh = modifyheaders.ModifyHeaders()
|
||||
with taddons.context(mh) as tctx:
|
||||
with pytest.raises(Exception, match="Cannot parse modify_headers .* Invalid file path"):
|
||||
tctx.configure(
|
||||
mh,
|
||||
modify_headers=["/~q/foo/@nonexistent"]
|
||||
)
|
||||
|
||||
tmpfile = tmpdir.join("replacement")
|
||||
tmpfile.write("bar")
|
||||
tctx.configure(
|
||||
mh,
|
||||
modify_headers=["/~q/foo/@" + str(tmpfile)]
|
||||
)
|
||||
tmpfile.remove()
|
||||
f = tflow.tflow()
|
||||
f.request.content = b"foo"
|
||||
mh.request(f)
|
||||
assert await tctx.master.await_log("could not read")
|
||||
|
||||
Loading…
Reference in New Issue
Block a user