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plugin: Fix an issue with string IDs ending up quoted twice

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The transparent passthrough that was recently introduced would end up
causing phantom quotes to appear around IDs when one of them was a
string. This happened for example when using `lightning-cli`, the code
would copy the quotes from the original request, insert our u64 ID,
and then re-add them on the way back as well.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2018-12-10 15:27:37 +01:00 committed by Rusty Russell
parent 6470630db9
commit 2834053457
1 changed files with 10 additions and 5 deletions
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15
lightningd/plugin.c
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@ -484,13 +484,18 @@ static void json_stream_forward_change_id(struct json_stream *stream,
const jsmntok_t *idtok,
const char *new_id)
{
/* We copy everything, but replace the id (maybe inside a string, we
* don't care) */
/* We copy everything, but replace the id. Special care has to
* be taken when the id that is being replaced is a string. If
* we don't crop the quotes off we'll transform a numeric
* new_id into a string, or even worse, quote a string id
* twice. */
size_t offset = idtok->type==JSMN_STRING?1:0;
json_stream_append_part(stream, buffer + toks->start,
idtok->start - toks->start);
idtok->start - toks->start - offset);
json_stream_append(stream, new_id);
json_stream_append_part(stream, buffer + idtok->end,
toks->end - idtok->end);
json_stream_append_part(stream, buffer + idtok->end + offset,
toks->end - idtok->end - offset);
/* We promise it will end in '\n\n' */
/* It's an object (with an id!): definitely can't be less that "{}" */