html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app https://github.com/simonw/datasette/issues/1439#issuecomment-1068461449,https://api.github.com/repos/simonw/datasette/issues/1439,1068461449,IC_kwDOBm6k_c4_r22J,9599,2022-03-15T20:51:26Z,2022-03-15T20:51:26Z,OWNER,I'm happy with this now that I've landed Tilde encoding in #1657.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1065988403,https://api.github.com/repos/simonw/datasette/issues/1439,1065988403,IC_kwDOBm6k_c4_ibEz,9599,2022-03-13T00:06:38Z,2022-03-13T00:07:19Z,OWNER,"If I want to reserve `-` as a character that CAN be used in URLs, the only remaining character that might make sense for escape sequences is `~` - based on this last line of characters that are escape from percentage encoding: ```python _ALWAYS_SAFE = frozenset(b'ABCDEFGHIJKLMNOPQRSTUVWXYZ' b'abcdefghijklmnopqrstuvwxyz' b'0123456789' b'_.-~') ``` So I'd add both `-` and `_` back to the safe list, but use `~` to escape `.` and `/` and suchlike.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1065987808,https://api.github.com/repos/simonw/datasette/issues/1439,1065987808,IC_kwDOBm6k_c4_ia7g,9599,2022-03-13T00:02:32Z,2022-03-13T00:02:32Z,OWNER,"OK, this has broken a lot more than I expected it would. Turns out `-` is a very common character in existing Datasette database names! https://datasette.io/-/databases for example has two: ```json [ { ""name"": ""docs-index"", ""path"": ""docs-index.db"", ""size"": 1007616, ""is_mutable"": false, ""is_memory"": false, ""hash"": ""0ac6c3de2762fcd174fd249fed8a8fa6046ea345173d22c2766186bf336462b2"" }, { ""name"": ""dogsheep-index"", ""path"": ""dogsheep-index.db"", ""size"": 5496832, ""is_mutable"": false, ""is_memory"": false, ""hash"": ""d1ea238d204e5b9ae783c86e4af5bcdf21267c1f391de3e468d9665494ee012a"" } ] ```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1060870237,https://api.github.com/repos/simonw/datasette/issues/1439,1060870237,IC_kwDOBm6k_c4_O5hd,9599,2022-03-07T16:19:22Z,2022-03-07T16:19:22Z,OWNER,"I didn't need to do any of the fancy regular expression routing stuff after all, since the new dash encoding format avoids using `/` so a simple `[^/]+` can capture the correct segments from the URL.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1060044007,https://api.github.com/repos/simonw/datasette/issues/1439,1060044007,IC_kwDOBm6k_c4_Lvzn,9599,2022-03-06T21:38:15Z,2022-03-06T21:38:15Z,OWNER,"Test: https://github.com/simonw/datasette/blob/d2e3fe3facf0ed0abf8b00cd54463af90dd6904d/tests/test_utils.py#L651-L666 One big advantage to this scheme is that redirecting old links to `%2F` pages (e.g. https://fivethirtyeight.datasettes.com/fivethirtyeight/twitter-ratio%2Fsenators) is easy - if you see a `%` in the `raw_path`, redirect to that page with the `%` replaced by `-`.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059903309,https://api.github.com/repos/simonw/datasette/issues/1439,1059903309,IC_kwDOBm6k_c4_LNdN,9599,2022-03-06T06:17:51Z,2022-03-06T06:17:51Z,OWNER,"Suggestion from a conversation with Seth Michael Larson: it would be neat if plugins could easily integrate with whatever scheme this ends up using, maybe with the `/db/table/-/plugin-name` standardized pattern or similar. Making it easy for plugins to do the right, consistent thing is a good idea.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059864154,https://api.github.com/repos/simonw/datasette/issues/1439,1059864154,IC_kwDOBm6k_c4_LD5a,9599,2022-03-06T00:59:04Z,2022-03-06T00:59:04Z,OWNER,"Needs more testing, but this seems to work for decoding the percent-escaped-with-dashes format: `urllib.parse.unquote(s.replace('-', '%'))`","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059855418,https://api.github.com/repos/simonw/datasette/issues/1439,1059855418,IC_kwDOBm6k_c4_LBw6,9599,2022-03-06T00:00:53Z,2022-03-06T00:04:18Z,OWNER,"```python _ESCAPE_SAFE = frozenset( b'ABCDEFGHIJKLMNOPQRSTUVWXYZ' b'abcdefghijklmnopqrstuvwxyz' b'0123456789_' ) # I removed b'.-~') class Quoter(dict): # Keeps a cache internally, via __missing__ def __missing__(self, b): # Handle a cache miss. Store quoted string in cache and return. res = chr(b) if b in _ESCAPE_SAFE else '-{:02X}'.format(b) self[b] = res return res quoter = Quoter().__getitem__ ''.join([quoter(char) for char in b'foo/bar.csv']) # 'foo-2Fbar-2Ecsv' ```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059854864,https://api.github.com/repos/simonw/datasette/issues/1439,1059854864,IC_kwDOBm6k_c4_LBoQ,9599,2022-03-05T23:59:05Z,2022-03-05T23:59:05Z,OWNER,"OK, for that percentage thing: the Python core implementation of URL percentage escaping deliberately ignores two of the characters we want to escape: `.` and `-`: https://github.com/python/cpython/blob/6927632492cbad86a250aa006c1847e03b03e70b/Lib/urllib/parse.py#L780-L783 ```python _ALWAYS_SAFE = frozenset(b'ABCDEFGHIJKLMNOPQRSTUVWXYZ' b'abcdefghijklmnopqrstuvwxyz' b'0123456789' b'_.-~') ``` It also defaults to skipping `/` (passed as a `safe=` parameter to various things). I'm going to try borrowing and modifying the core of the Python implementation: https://github.com/python/cpython/blob/6927632492cbad86a250aa006c1847e03b03e70b/Lib/urllib/parse.py#L795-L814 ```python class _Quoter(dict): """"""A mapping from bytes numbers (in range(0,256)) to strings. String values are percent-encoded byte values, unless the key < 128, and in either of the specified safe set, or the always safe set. """""" # Keeps a cache internally, via __missing__, for efficiency (lookups # of cached keys don't call Python code at all). def __init__(self, safe): """"""safe: bytes object."""""" self.safe = _ALWAYS_SAFE.union(safe) def __repr__(self): return f"""" def __missing__(self, b): # Handle a cache miss. Store quoted string in cache and return. res = chr(b) if b in self.safe else '%{:02X}'.format(b) self[b] = res return res ```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059853526,https://api.github.com/repos/simonw/datasette/issues/1439,1059853526,IC_kwDOBm6k_c4_LBTW,9599,2022-03-05T23:49:59Z,2022-03-05T23:49:59Z,OWNER,"I want to try regular percentage encoding, except that it also encodes both the `-` and the `.` characters, AND it uses `-` instead of `%` as the encoding character. Should check what it does with emoji too.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059851259,https://api.github.com/repos/simonw/datasette/issues/1439,1059851259,IC_kwDOBm6k_c4_LAv7,9599,2022-03-05T23:35:47Z,2022-03-05T23:35:59Z,OWNER,"This [comment from glyph](https://twitter.com/glyph/status/1500244937312329730) got me thinking: > Have you considered replacing % with some other character and then using percent-encoding? What happens if a table name includes a `%` character and that ends up getting mangled by a misbehaving proxy? I should consider `%` in the escaping system too. And maybe go with that suggestion of using percent-encoding directly but with a different character.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059850369,https://api.github.com/repos/simonw/datasette/issues/1439,1059850369,IC_kwDOBm6k_c4_LAiB,9599,2022-03-05T23:28:56Z,2022-03-05T23:28:56Z,OWNER,"Lots of great conversations about the dash encoding implementation on Twitter: https://twitter.com/simonw/status/1500228316309061633 @dracos helped me figure out a simpler regex: https://twitter.com/dracos/status/1500236433809973248 `^/(?P[^/]+)/(?P[^\/\-\.]*|\-/|\-\.|\-\-)*(?P\.\w+)?$` ![image](https://user-images.githubusercontent.com/9599/156903088-c01933ae-4713-4e91-8d71-affebf70b945.png) ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059836599,https://api.github.com/repos/simonw/datasette/issues/1439,1059836599,IC_kwDOBm6k_c4_K9K3,9599,2022-03-05T21:52:10Z,2022-03-05T21:52:10Z,OWNER,Blogged about this here: https://simonwillison.net/2022/Mar/5/dash-encoding/,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045069481,https://api.github.com/repos/simonw/datasette/issues/1439,1045069481,IC_kwDOBm6k_c4-Sn6p,9599,2022-02-18T19:34:41Z,2022-03-05T21:32:22Z,OWNER,"I think I got format extraction working! https://regex101.com/r/A0bW1D/1 ^/(?P[^/]+)/(?P
(?:[^\/\-\.]*|(?:\-/)*|(?:\-\.)*|(?:\-\-)*)*?)(?:(?\w+))?$ I had to make that crazy inner one even more complicated to stop it from capturing `.` that was not part of `-.`. (?:[^\/\-\.]*|(?:\-/)*|(?:\-\.)*|(?:\-\-)*)* Visualized: So now I have a regex which can extract out the dot-encoded table name AND spot if there is an optional `.format` at the end: If I end up using this in Datasette it's going to need VERY comprehensive unit tests and inline documentation.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059822391,https://api.github.com/repos/simonw/datasette/issues/1439,1059822391,IC_kwDOBm6k_c4_K5s3,9599,2022-03-05T19:50:12Z,2022-03-05T19:50:12Z,OWNER,I'm going to move this work to a PR.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059822151,https://api.github.com/repos/simonw/datasette/issues/1439,1059822151,IC_kwDOBm6k_c4_K5pH,9599,2022-03-05T19:48:35Z,2022-03-05T19:48:35Z,OWNER,Those new docs: https://github.com/simonw/datasette/blob/d1cb73180b4b5a07538380db76298618a5fc46b6/docs/internals.rst#dash-encoding,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1059802318,https://api.github.com/repos/simonw/datasette/issues/1439,1059802318,IC_kwDOBm6k_c4_K0zO,9599,2022-03-05T17:34:33Z,2022-03-05T17:34:33Z,OWNER,"Wrote documentation: ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1053973425,https://api.github.com/repos/simonw/datasette/issues/1439,1053973425,IC_kwDOBm6k_c4-0lux,9599,2022-02-28T07:40:12Z,2022-02-28T07:40:12Z,OWNER,"If I make this change it will break existing links to one of the oldest Datasette demos: http://fivethirtyeight.datasettes.com/fivethirtyeight/avengers%2Favengers A plugin that fixes those by redirecting them on 404 would be neat.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1049126151,https://api.github.com/repos/simonw/datasette/issues/1439,1049126151,IC_kwDOBm6k_c4-iGUH,9599,2022-02-23T19:17:01Z,2022-02-23T19:17:01Z,OWNER,Actually the relevant code looks to be: https://github.com/simonw/datasette/blob/7d24fd405f3c60e4c852c5d746c91aa2ba23cf5b/datasette/views/base.py#L481-L498,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1049124390,https://api.github.com/repos/simonw/datasette/issues/1439,1049124390,IC_kwDOBm6k_c4-iF4m,9599,2022-02-23T19:15:00Z,2022-02-23T19:15:00Z,OWNER,"I'll start by modifying this function: https://github.com/simonw/datasette/blob/458f03ad3a454d271f47a643f4530bd8b60ddb76/datasette/utils/__init__.py#L732-L749 Later I want to move this to the routing layer to split out `format` automatically, as seen in the regexes here: https://github.com/simonw/datasette/issues/1439#issuecomment-1045069481","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1049114724,https://api.github.com/repos/simonw/datasette/issues/1439,1049114724,IC_kwDOBm6k_c4-iDhk,9599,2022-02-23T19:04:40Z,2022-02-23T19:04:40Z,OWNER,I'm going to try dash encoding for table names (and row IDs) in a branch and see how I like it.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045269544,https://api.github.com/repos/simonw/datasette/issues/1439,1045269544,IC_kwDOBm6k_c4-TYwo,9599,2022-02-18T22:19:29Z,2022-02-18T22:19:29Z,OWNER,"Note that I've ruled out using `Accept: application/json` to return JSON because it turns out Cloudflare and potentially other CDNs ignore the `Vary: Accept` header entirely: - https://github.com/simonw/datasette/issues/1534","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045134050,https://api.github.com/repos/simonw/datasette/issues/1439,1045134050,IC_kwDOBm6k_c4-S3ri,9599,2022-02-18T20:25:04Z,2022-02-18T20:25:04Z,OWNER,Here's a useful modern spec for how existing URL percentage encoding is supposed to work: https://url.spec.whatwg.org/#percent-encoded-bytes,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045131086,https://api.github.com/repos/simonw/datasette/issues/1439,1045131086,IC_kwDOBm6k_c4-S29O,9599,2022-02-18T20:22:13Z,2022-02-18T20:22:47Z,OWNER,"Should it encode `%` symbols too, since they have a special meaning in URLs and we can't guarantee that every single web server / proxy out there will round-trip them safely using percentage encoding? If so, would need to pick a different encoding character for them. Maybe `%` becomes `-p` - and in that case `/` could become `-s` too. Is it worth expanding dash-encoding outside of just `/` and `-` and `.` though? Not sure.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045117304,https://api.github.com/repos/simonw/datasette/issues/1439,1045117304,IC_kwDOBm6k_c4-Szl4,9599,2022-02-18T20:09:22Z,2022-02-18T20:09:22Z,OWNER,Adopting this could result in supporting database files with surprising characters in their filename too.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045108611,https://api.github.com/repos/simonw/datasette/issues/1439,1045108611,IC_kwDOBm6k_c4-SxeD,9599,2022-02-18T20:02:19Z,2022-02-18T20:08:34Z,OWNER,"One other potential variant: ```python def dash_encode(s): return s.replace(""-"", ""-dash-"").replace(""."", ""-dot-"").replace(""/"", ""-slash-"") def dash_decode(s): return s.replace(""-slash-"", ""/"").replace(""-dot-"", ""."").replace(""-dash-"", ""-"") ``` Except this has bugs - it doesn't round-trip safely, because it can get confused about things like `-dash-slash-` in terms of is that a `-dash-` or a `-slash-`? ```pycon >>> dash_encode(""/db/table-.csv.csv"") '-slash-db-slash-table-dash--dot-csv-dot-csv' >>> dash_decode('-slash-db-slash-table-dash--dot-csv-dot-csv') '/db/table-.csv.csv' >>> dash_encode('-slash-db-slash-table-dash--dot-csv-dot-csv') '-dash-slash-dash-db-dash-slash-dash-table-dash-dash-dash--dash-dot-dash-csv-dash-dot-dash-csv' >>> dash_decode('-dash-slash-dash-db-dash-slash-dash-table-dash-dash-dash--dash-dot-dash-csv-dash-dot-dash-csv') '-dash/dash-db-dash/dash-table-dash--dash.dash-csv-dash.dash-csv' ``` ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045111309,https://api.github.com/repos/simonw/datasette/issues/1439,1045111309,IC_kwDOBm6k_c4-SyIN,9599,2022-02-18T20:04:24Z,2022-02-18T20:05:40Z,OWNER,"This made me worry that my current `dash_decode()` implementation had unknown round-trip bugs, but thankfully this works OK: ```pycon >>> dash_encode(""/db/table-.csv.csv"") '-/db-/table---.csv-.csv' >>> dash_encode('-/db-/table---.csv-.csv') '---/db---/table-------.csv---.csv' >>> dash_decode('---/db---/table-------.csv---.csv') '-/db-/table---.csv-.csv' >>> dash_decode('-/db-/table---.csv-.csv') '/db/table-.csv.csv' ``` The regex still works against that double-encoded example too: ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045099290,https://api.github.com/repos/simonw/datasette/issues/1439,1045099290,IC_kwDOBm6k_c4-SvMa,9599,2022-02-18T19:56:18Z,2022-02-18T19:56:30Z,OWNER,"> ```python > def dash_encode(s): > return s.replace(""-"", ""--"").replace(""."", ""-."").replace(""/"", ""-/"") > > def dash_decode(s): > return s.replace(""-/"", ""/"").replace(""-."", ""."").replace(""--"", ""-"") > ``` I think **dash-encoding** (new name for this) is the right way forward here.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045024276,https://api.github.com/repos/simonw/datasette/issues/1439,1045024276,IC_kwDOBm6k_c4-Sc4U,9599,2022-02-18T19:01:42Z,2022-02-18T19:55:24Z,OWNER,"> Maybe I should use `-/` to encode forward slashes too, to defend against any ASGI servers that might not implement `raw_path` correctly. ```python def dash_encode(s): return s.replace(""-"", ""--"").replace(""."", ""-."").replace(""/"", ""-/"") def dash_decode(s): return s.replace(""-/"", ""/"").replace(""-."", ""."").replace(""--"", ""-"") ``` ```pycon >>> dash_encode(""foo/bar/baz.csv"") 'foo-/bar-/baz-.csv' >>> dash_decode('foo-/bar-/baz-.csv') 'foo/bar/baz.csv' ```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045095348,https://api.github.com/repos/simonw/datasette/issues/1439,1045095348,IC_kwDOBm6k_c4-SuO0,9599,2022-02-18T19:53:48Z,2022-02-18T19:53:48Z,OWNER,"> Ugh, one disadvantage I just spotted with this: Datasette already has a `/-/versions.json` convention where ""system"" URLs are namespaced under `/-/` - but that could be confused under this new scheme with the `-/` escaping sequence. > > And I've thought about adding `/db/-/special` and `/db/table/-/special` URLs in the past too. I don't think this matters. The new regex does indeed capture that kind of page: But Datasette goes through configured route regular expressions in order - so I can have the regex that captures `/db/-/special` routes listed before the one that captures tables and formats.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045081042,https://api.github.com/repos/simonw/datasette/issues/1439,1045081042,IC_kwDOBm6k_c4-SqvS,9599,2022-02-18T19:44:12Z,2022-02-18T19:51:34Z,OWNER,"```python def dot_encode(s): return s.replace(""."", "".."").replace(""/"", ""./"") def dot_decode(s): return s.replace(""./"", ""/"").replace("".."", ""."") ``` No need for hyphen encoding in this variant at all, which simplifies things a bit. (Update: this is flawed, see https://github.com/simonw/datasette/issues/1439#issuecomment-1045086033)","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045086033,https://api.github.com/repos/simonw/datasette/issues/1439,1045086033,IC_kwDOBm6k_c4-Sr9R,9599,2022-02-18T19:47:43Z,2022-02-18T19:51:11Z,OWNER,"- https://datasette.io/-/asgi-scope/db/./db./table-..csv..csv - https://til.simonwillison.net/-/asgi-scope/db/./db./table-..csv..csv Do both of those survive the round-trip to populate `raw_path` correctly? No! In both cases the `/./` bit goes missing. It looks like this might even be a client issue - `curl` shows me this: ``` ~ % curl -vv -i 'https://datasette.io/-/asgi-scope/db/./db./table-..csv..csv' * Trying 216.239.32.21:443... * Connected to datasette.io (216.239.32.21) port 443 (#0) * ALPN, offering http/1.1 * TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 * Server certificate: datasette.io * Server certificate: R3 * Server certificate: ISRG Root X1 > GET /-/asgi-scope/db/db./table-..csv..csv HTTP/1.1 ``` So `curl` decided to turn `/-/asgi-scope/db/./db./table` into `/-/asgi-scope/db/db./table` before even sending the request.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045082891,https://api.github.com/repos/simonw/datasette/issues/1439,1045082891,IC_kwDOBm6k_c4-SrML,9599,2022-02-18T19:45:32Z,2022-02-18T19:45:32Z,OWNER,"```pycon >>> dot_encode(""/db/table-.csv.csv"") './db./table-..csv..csv' >>> dot_decode('./db./table-..csv..csv') '/db/table-.csv.csv' ``` I worry that web servers might treat `./` in a special way though.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045077590,https://api.github.com/repos/simonw/datasette/issues/1439,1045077590,IC_kwDOBm6k_c4-Sp5W,9599,2022-02-18T19:41:37Z,2022-02-18T19:42:41Z,OWNER,"Ugh, one disadvantage I just spotted with this: Datasette already has a `/-/versions.json` convention where ""system"" URLs are namespaced under `/-/` - but that could be confused under this new scheme with the `-/` escaping sequence. And I've thought about adding `/db/-/special` and `/db/table/-/special` URLs in the past too. Maybe change this system to use `.` as the escaping character instead of `-`?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045075207,https://api.github.com/repos/simonw/datasette/issues/1439,1045075207,IC_kwDOBm6k_c4-SpUH,9599,2022-02-18T19:39:35Z,2022-02-18T19:40:13Z,OWNER,"> And if for some horific reason you had a table with the name `/db/table-.csv.csv` (so `/db/` was the first part of the actual table name in SQLite) the URLs would look like this: > > * `/db/%2Fdb%2Ftable---.csv-.csv` - the HTML version > * `/db/%2Fdb%2Ftable---.csv-.csv.csv` - the CSV version > * `/db/%2Fdb%2Ftable---.csv-.csv.json` - the JSON version Here's what those look like with the updated version of `dot_dash_encode()` that also encodes `/` as `-/`: - `/db/-/db-/table---.csv-.csv` - HTML - `/db/-/db-/table---.csv-.csv.csv` - CSV - `/db/-/db-/table---.csv-.csv.json` - JSON ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045059427,https://api.github.com/repos/simonw/datasette/issues/1439,1045059427,IC_kwDOBm6k_c4-Sldj,9599,2022-02-18T19:26:25Z,2022-02-18T19:26:25Z,OWNER,"With this new pattern I could probably extract out the optional `.json` format string as part of the initial route capturing regex too, rather than the current `table_and_format` hack.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045055772,https://api.github.com/repos/simonw/datasette/issues/1439,1045055772,IC_kwDOBm6k_c4-Skkc,9599,2022-02-18T19:23:33Z,2022-02-18T19:25:42Z,OWNER,"I want a match for this URL: /db/table-/with-/slashes-.csv Maybe this: ^/(?P[^/]+)/(?P([^/]*|(\-/)*|(\-\.)*|(\.\.)*)*$) Here we are matching a sequence of: ([^/]*|(\-/)*|(\-\.)*|(\-\-)*)* So a combination of not-slashes OR -/ or -. Or -- sequences ^/(?P[^/]+)/(?P([^/]*|(\-/)*|(\-\.)*|(\-\-)*)*$) Try that with non-capturing bits: ^/(?P[^/]+)/(?P(?:[^/]*|(?:\-/)*|(?:\-\.)*|(?:\-\-)*)*$) `(?:[^/]*|(?:\-/)*|(?:\-\.)*|(?:\-\-)*)*` visualized is: Here's the explanation on regex101.com https://regex101.com/r/CPnsIO/1 ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045032377,https://api.github.com/repos/simonw/datasette/issues/1439,1045032377,IC_kwDOBm6k_c4-Se25,9599,2022-02-18T19:06:50Z,2022-02-18T19:06:50Z,OWNER,"How does URL routing for https://latest.datasette.io/fixtures/table%2Fwith%2Fslashes.csv work? Right now it's https://github.com/simonw/datasette/blob/7d24fd405f3c60e4c852c5d746c91aa2ba23cf5b/datasette/app.py#L1098-L1101 That's not going to capture the dot-dash encoding version of that table name: ```pycon >>> dot_dash_encode(""table/with/slashes.csv"") 'table-/with-/slashes-.csv' ``` Probably needs a fancy regex trick like a negative lookbehind assertion or similar.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1045027067,https://api.github.com/repos/simonw/datasette/issues/1439,1045027067,IC_kwDOBm6k_c4-Sdj7,9599,2022-02-18T19:03:26Z,2022-02-18T19:03:26Z,OWNER,"(If I make this change it may break some existing Datasette installations when they upgrade - I could try and build a plugin for them which triggers on 404s and checks to see if the old format would return a 200 response, then returns that.)","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-1031141849,https://api.github.com/repos/simonw/datasette/issues/1439,1031141849,IC_kwDOBm6k_c49dfnZ,9599,2022-02-07T07:11:11Z,2022-02-07T07:11:11Z,OWNER,"I added a Link header to solve this problem for the JSON version in: - #1533 ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900715375,https://api.github.com/repos/simonw/datasette/issues/1439,900715375,IC_kwDOBm6k_c41r9Nv,9599,2021-08-18T00:15:28Z,2021-08-18T00:15:28Z,OWNER,"Maybe I should use `-/` to encode forward slashes too, to defend against any ASGI servers that might not implement `raw_path` correctly.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900714630,https://api.github.com/repos/simonw/datasette/issues/1439,900714630,IC_kwDOBm6k_c41r9CG,9599,2021-08-18T00:13:33Z,2021-08-18T00:13:33Z,OWNER,"The documentation should definitely cover how table names become URLs, in case any third party code needs to be able to calculate this themselves.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900712981,https://api.github.com/repos/simonw/datasette/issues/1439,900712981,IC_kwDOBm6k_c41r8oV,9599,2021-08-18T00:09:59Z,2021-08-18T00:12:32Z,OWNER,"So given the original examples, a table called `table.csv` would have the following URLs: - `/db/table-.csv` - the HTML version - `/db/table-.csv.csv` - the CSV version - `/db/table-.csv.json` - the JSON version And if for some horific reason you had a table with the name `/db/table-.csv.csv` (so `/db/` was the first part of the actual table name in SQLite) the URLs would look like this: - `/db/%2Fdb%2Ftable---.csv-.csv` - the HTML version - `/db/%2Fdb%2Ftable---.csv-.csv.csv` - the CSV version - `/db/%2Fdb%2Ftable---.csv-.csv.json` - the JSON version","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900711967,https://api.github.com/repos/simonw/datasette/issues/1439,900711967,IC_kwDOBm6k_c41r8Yf,9599,2021-08-18T00:08:09Z,2021-08-18T00:08:09Z,OWNER,"Here's an alternative I just made up which I'm calling ""dot dash"" encoding: ```python def dot_dash_encode(s): return s.replace(""-"", ""--"").replace(""."", ""-."") def dot_dash_decode(s): return s.replace(""-."", ""."").replace(""--"", ""-"") ``` And some examples: ```python for example in ( ""hello"", ""hello.csv"", ""hello-and-so-on.csv"", ""hello-.csv"", ""hello--and--so--on-.csv"", ""hello.csv."", ""hello.csv.-"", ""hello.csv.--"", ): print(example) print(dot_dash_encode(example)) print(example == dot_dash_decode(dot_dash_encode(example))) print() ``` Outputs: ``` hello hello True hello.csv hello-.csv True hello-and-so-on.csv hello--and--so--on-.csv True hello-.csv hello---.csv True hello--and--so--on-.csv hello----and----so----on---.csv True hello.csv. hello-.csv-. True hello.csv.- hello-.csv-.-- True hello.csv.-- hello-.csv-.---- True ```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900709703,https://api.github.com/repos/simonw/datasette/issues/1439,900709703,IC_kwDOBm6k_c41r71H,9599,2021-08-18T00:03:09Z,2021-08-18T00:03:09Z,OWNER,"But... what if I invent my own escaping scheme? I actually did this once before, in https://github.com/simonw/datasette/commit/9fdb47ca952b93b7b60adddb965ea6642b1ff523 - while I was working on porting Datasette to ASGI in https://github.com/simonw/datasette/issues/272#issuecomment-494192779 because ASGI didn't yet have the `raw_path` mechanism. I could bring that back - it looked like this: ``` ""table/and/slashes"" => ""tableU+002FandU+002Fslashes"" ""~table"" => ""U+007Etable"" ""+bobcats!"" => ""U+002Bbobcats!"" ""U+007Etable"" => ""UU+002B007Etable"" ``` But I didn't particularly like it - it was quite verbose.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900705226,https://api.github.com/repos/simonw/datasette/issues/1439,900705226,IC_kwDOBm6k_c41r6vK,9599,2021-08-17T23:50:32Z,2021-08-17T23:50:47Z,OWNER,"An alternative solution would be to use some form of escaping for the characters that form the name of the table. The obvious way to do this would be URL-encoding - but it doesn't hold for `.` characters. The hex for that is `%2E` but watch what happens with that in a URL: ``` # Against Cloud Run: curl -s 'https://datasette.io/-/asgi-scope/foo/bar%2Fbaz%2E' | rg path 'path': '/-/asgi-scope/foo/bar/baz.', 'raw_path': b'/-/asgi-scope/foo/bar%2Fbaz.', 'root_path': '', # Against Vercel: curl -s 'https://til.simonwillison.net/-/asgi-scope/foo/bar%2Fbaz%2E' | rg path 'path': '/-/asgi-scope/foo/bar%2Fbaz%2E', 'raw_path': b'/-/asgi-scope/foo/bar%2Fbaz%2E', 'root_path': '', ``` Surprisingly in this case Vercel DOES keep it intact, but Cloud Run does not. It's still no good though: I need a solution that works on Vercel, Cloud Run and every other potential hosting provider too.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047, https://github.com/simonw/datasette/issues/1439#issuecomment-900699670,https://api.github.com/repos/simonw/datasette/issues/1439,900699670,IC_kwDOBm6k_c41r5YW,9599,2021-08-17T23:34:23Z,2021-08-17T23:34:23Z,OWNER,"The challenge comes down to telling the difference between the following: - `/db/table` - an HTML table page - `/db/table.csv` - the CSV version of `/db/table` - `/db/table.csv` - no this one is actually a database table called `table.csv` - `/db/table.csv.csv` - the CSV version of `/db/table.csv` - `/db/table.csv.csv.csv` and so on...","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",973139047,