@httpland/content-range-parser
v1.0.0
Published
HTTP Content-Range header field parser
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content-range-parser
HTTP Content-Range header field parser.
Compliant with RFC 9110, 14.4. Content-Range.
Deserialization
Parses string into ContentRange.
import { parseContentRange } from "https://deno.land/x/content_range_parser@$VERSION/parse.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(parseContentRange("bytes 0-100/1000"), {
rangeUnit: "bytes",
firstPos: 0,
lastPos: 100,
completeLength: 1000,
});
assertEquals(parseContentRange("bytes 100-200/*"), {
rangeUnit: "bytes",
firstPos: 100,
lastPos: 200,
completeLength: undefined,
});
assertEquals(parseContentRange("bytes */1000"), {
rangeUnit: "bytes",
completeLength: 1000,
});
Throwing error
If input is invalid, the following error occurs:
Syntax error
Throws SyntaxError
if the input is invalid
<Content-Range>
syntax.
import { parseContentRange } from "https://deno.land/x/content_range_parser@$VERSION/parse.ts";
import { assertThrows } from "https://deno.land/std/testing/asserts.ts";
assertThrows(() => parseContentRange("<invalid>"));
Semantic error
Throw Error
if the input contains invalid semantics.
Invalid semantics are indicated as follows:
A Content-Range field value is invalid if it contains a range-resp that has a last-pos value less than its first-pos value, or a complete-length value less than or equal to its last-pos value. The recipient of an invalid Content-Range MUST NOT attempt to recombine the received content with a stored representation.
import { parseContentRange } from "https://deno.land/x/content_range_parser@$VERSION/parse.ts";
import { assertThrows } from "https://deno.land/std/testing/asserts.ts";
assertThrows(() => parseContentRange("bytes 100-0/*"));
assertThrows(() => parseContentRange("bytes 100-200/0"));
Serialization
Serialize ContentRange into string.
import { stringifyContentRange } from "https://deno.land/x/content_range_parser@$VERSION/stringify.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(
stringifyContentRange({
rangeUnit: "bytes",
firstPos: 0,
lastPos: 100,
completeLength: 1000,
}),
"bytes 0-100/1000",
);
assertEquals(
stringifyContentRange({
rangeUnit: "bytes",
firstPos: 100,
lastPos: 200,
completeLength: undefined,
}),
"bytes 100-200/*",
);
assertEquals(
stringifyContentRange({ rangeUnit: "bytes", completeLength: 1000 }),
"bytes */1000",
);
Throwing error
Throws TypeError
if ContentRange contains invalid value.
import { stringifyContentRange } from "https://deno.land/x/content_range_parser@$VERSION/stringify.ts";
import { assertThrows } from "https://deno.land/std/testing/asserts.ts";
assertThrows(() =>
stringifyContentRange({ rangeUnit: "<range-unit>", completeLength: NaN })
);
then, semantic errors are also checked.
import { stringifyContentRange } from "https://deno.land/x/content_range_parser@$VERSION/stringify.ts";
import { assertThrows } from "https://deno.land/std/testing/asserts.ts";
assertThrows(() =>
stringifyContentRange({
rangeUnit: "<range-unit>",
firstPos: 1,
lastPos: 0, // firstPos <= lastPos
completeLength: undefined,
})
);
assertThrows(() =>
stringifyContentRange({
rangeUnit: "<range-unit>",
firstPos: 0,
lastPos: 100,
completeLength: 0, // lastPos < completeLength
})
);
Content Range
ContentRange
is a structured object for Content-Range
header.
Each field name is from camel Case of ABNF definition name.
| Name | Type | Description |
| --------- | -------- | --------------------------------------------------------------------------------------------- |
| rangeUnit | string
| Representation of <range-unit>
. |
and
| Name | Type | Description |
| -------------- | --------------------------- | ------------------------------------------------------------------------------------------------------ |
| firstPost | number
| Representation of <first-pos>
. |
| lastPos | number
| Representation of <last-pos>
. |
| completeLength | number
| undefined
| Representation of <unsatisfied-range>
. |
or
| Name | Type | Description |
| -------------- | -------- | ----------------------------------------------------------------------------------------------------- |
| completeLength | number
| Representation of <unsatisfied-range>
|
Utilities
It provides utilities.
isRangeResp
Whether the input is RangeResp
or not.
import {
type ContentRange,
isRangeResp,
} from "https://deno.land/x/content_range_parser@$VERSION/mod.ts";
import { assert } from "https://deno.land/std/testing/asserts.ts";
declare const contentRange: ContentRange;
assert(isRangeResp(contentRange));
isUnsatisfiedRange
Whether the input is UnsatisfiedRange
or not.
import {
type ContentRange,
isUnsatisfiedRange,
} from "https://deno.land/x/content_range_parser@$VERSION/mod.ts";
import { assert } from "https://deno.land/std/testing/asserts.ts";
declare const contentRange: ContentRange;
assert(isUnsatisfiedRange(contentRange));
API
All APIs can be found in the deno doc.
License
Copyright © 2023-present httpland.
Released under the MIT license