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Document CanonicalJson
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TODO.txt
2
TODO.txt
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@ -27,7 +27,7 @@ Due: January 1, 2023
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[~] Internal API docs
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[x] Array
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[x] Base64
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[ ] CanonicalJson
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[x] CanonicalJson
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[ ] Config
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[ ] API (Config.3)
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[ ] File format (Config.5)
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69
man/man3/CanonicalJson.3
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69
man/man3/CanonicalJson.3
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.Dd $Mdocdate: November 30 2022 $
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.Dt CANONICALJSON 3
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.Os Telodendria Project
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.Sh NAME
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.Nm CanonicalJson
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.Nd An extension of JSON that produces the Matrix spec's "canonical" JSON.
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.Sh SYNOPSIS
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.In CanonicalJson.h
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.Ft int
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.Fn CanonicalJsonEncode "HashMap *" "FILE *"
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.Ft char *
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.Fn CanonicalJsonEncodeToString "HashMap *"
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.Sh DESCRIPTION
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.Pp
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.Nm
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is an extension of
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.Xr Json 3
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that is specifically designed to produce the Matrix specification's
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"canonical" JSON.
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.Pp
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Canonical JSON is defined as JSON that:
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.Bl -bullet -offset indent
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.It
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Does not have any unecessary whitespace.
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.It
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Has all object keys lexicographically sorted.
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.It
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Does not contain any floating point numerical values.
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.El
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.Pp
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The regular JSON encoder has no such rules, because normally they are
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not needed. However, Canonical JSON is needed to consistently sign JSON
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objects.
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.Pp
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.Fn CanonicalJsonEncode
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encodes a JSON object following the rules of Canonical Json. See the
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documentation for
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.Fn JsonEncode ,
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documented in
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.Xr Json 3
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for more details on how JSON encoding operates. This function exists
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as an alternative to
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.Fn JsonEncode ,
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but should not be preferred to it in most circumstances. It is a lot
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more costly, as it must lexicographically sort all keys and strip out
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float values. If at all possible, use
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.Fn JsonEncode
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because it is much cheaper both in terms of memory and CPU time.
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.Pp
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.Fn CanonicalJsonEncodeToString
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encodes a JSON object to a string.
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.Xr Json 3
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doesn't have any way to send JSON to a string, because there's
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absolutely no reason to handle JSON strings in most cases. However,
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the sole reason Canonical JSON exists is so that JSON objects can
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be signed in a consistent way. Thus, you need a string to pass to
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the signing function.
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.Sh RETURN VALUES
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.Pp
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.Fn CanonicalJsonEncode
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returns whether or not the JSON encoding operation was sucessful.
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This function will fail only if NULL was given for any parameter.
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Otherwise, if an invalid pointer is given, undefined behavior results.
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.Pp
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.Fn CanonicalJsonEncodeToString
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returns a C string containing the canonical JSON representation of
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the given object, or NULL if the encoding failed.
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.Sh SEE ALSO
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.Xr Json 3
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@ -235,6 +235,12 @@ Smart memory management API.
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A feature-complete API for reading and writing JSON.
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</td>
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</tr>
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<tr>
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<td><a href="man/man3/CanonicalJson.3.html">CanonicalJson(3)</a></td>
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<td>
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An extension to the Json API that implements Matrix's canonical JSON.
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</td>
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</tr>
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</table>
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<h2 id="resources">Resources</h2>
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<ul>
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@ -22,64 +22,15 @@
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* SOFTWARE.
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*/
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/*
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* CanonicalJson.h: An expansion of the JSON encoding functionality
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* that is specifically designed to produce the Matrix spec's
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* "canonical" JSON.
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*
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* Canonical JSON is defined as JSON that:
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*
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* - Does not have any unecessary whitespace.
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* - Has all object keys lexicographically sorted.
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* - Does not contain any float values.
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*
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* The regular JSON encoder has no such rules, because normally they
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* are not needed. However, Canonical JSON is needed to be able to
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* sign JSON objects in a consistent way.
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*/
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#ifndef TELODENDRIA_CANONICALJSON_H
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#define TELODENDRIA_CANONICALJSON_H
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#include <stdio.h>
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#include <HashMap.h>
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/*
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* Encode a JSON object following the rules of canonical JSON. See
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* JsonEncode() for more details on how JSON encoding operates.
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*
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* This function exists as an alternative to JsonEncode(), but should
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* not be preferred to JsonEncode() in normal circumstances. It is
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* a lot more costly, as it must lexicographically sort all keys and
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* strip out float values. If at all possible, use JsonEncode(),
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* because it is much cheaper in terms of memory and CPU time.
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*
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* Params:
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*
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* (HashMap *) The JSON object to encode. Note that all values must
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* be JsonValues.
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* (FILE *) The output stream to write the JSON object to.
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*
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* Return: Whether or not the JSON encoding was successful. This
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* function may fail if NULL was given for any parameter.
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*/
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extern int
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CanonicalJsonEncode(HashMap *, FILE *);
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/*
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* Encode the JSON object to a string. The regular JSON encoding
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* library doesn't have a way to send JSON to strings, because there's
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* absolutely no reason to handle JSON strings. However, the sole
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* reason canonical JSON exists is so that JSON objects can be signed.
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* Thus, you need a string to pass to the signing function.
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*
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* Params:
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*
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* (HashMap *) The JSON object to encode. Note that all values must
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* be JsonValues.
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*
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* Return: A string containing the canonical JSON representation of
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* the given object, or NULL if the encoding failed.
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*/
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extern char *
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CanonicalJsonEncodeToString(HashMap *);
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