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738f457309
If the client has an old version of the code which is not present on the server, don't throw a 500; instead, default to the same `unable to look up in source map` message is used when the line numbers don't line up.
73 lines
3.2 KiB
Python
73 lines
3.2 KiB
Python
import os
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import re
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from typing import Dict, List, Optional
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import sourcemap
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from zerver.lib.pysa import mark_sanitized
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class SourceMap:
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"""Map (line, column) pairs from generated to source file."""
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def __init__(self, sourcemap_dirs: List[str]) -> None:
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self._dirs = sourcemap_dirs
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self._indices: Dict[str, sourcemap.SourceMapDecoder] = {}
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def _index_for(self, minified_src: str) -> Optional[sourcemap.SourceMapDecoder]:
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"""Return the source map index for minified_src, loading it if not
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already loaded."""
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# Prevent path traversal
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assert ".." not in minified_src and "/" not in minified_src
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if minified_src not in self._indices:
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for source_dir in self._dirs:
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filename = os.path.join(source_dir, minified_src + ".map")
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if os.path.isfile(filename):
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# Use 'mark_sanitized' to force Pysa to ignore the fact that
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# 'filename' is user controlled. While putting user
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# controlled data into a filesystem operation is bad, in
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# this case it's benign because 'filename' can't traverse
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# directories outside of the pre-configured 'sourcemap_dirs'
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# (due to the above assertions) and will always end in
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# '.map'. Additionally, the result of this function is used
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# for error logging and not returned to the user, so
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# controlling the loaded file would not be useful to an
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# attacker.
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with open(mark_sanitized(filename)) as fp:
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self._indices[minified_src] = sourcemap.load(fp)
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break
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return self._indices.get(minified_src)
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def annotate_stacktrace(self, stacktrace: str) -> str:
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out: str = ""
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for ln in stacktrace.splitlines():
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out += ln + "\n"
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match = re.search(r"/static/webpack-bundles/([^:]+):(\d+):(\d+)", ln)
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if match:
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# Get the appropriate source map for the minified file.
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minified_src = match.groups()[0]
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index = self._index_for(minified_src)
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if index is None:
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out += " [Unable to look up in source map]\n"
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continue
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gen_line, gen_col = list(map(int, match.groups()[1:3]))
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# The sourcemap lib is 0-based, so subtract 1 from line and col.
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try:
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result = index.lookup(line=gen_line - 1, column=gen_col - 1)
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display_src = result.src
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if display_src is not None:
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webpack_prefix = "webpack:///"
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if display_src.startswith(webpack_prefix):
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display_src = display_src[len(webpack_prefix) :]
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out += f" = {display_src} line {result.src_line+1} column {result.src_col+1}\n"
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except IndexError:
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out += " [Unable to look up in source map]\n"
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if ln.startswith(" at"):
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out += "\n"
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return out
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