81 lines
2.9 KiB
Plaintext
81 lines
2.9 KiB
Plaintext
---
|
|
page_title: uuidv5 - Functions - Configuration Language
|
|
description: >-
|
|
The uuidv5 function generates a uuid v5 string representation of the value in
|
|
the specified namespace.
|
|
---
|
|
|
|
# `uuidv5` Function
|
|
|
|
`uuidv5` generates a _name-based_ UUID, as described in
|
|
[RFC 4122 section 4.3](https://tools.ietf.org/html/rfc4122#section-4.3),
|
|
also known as a "version 5" UUID.
|
|
|
|
```
|
|
uuidv5(namespace, name)
|
|
```
|
|
|
|
Unlike the pseudo-random UUIDs generated by
|
|
[`uuid`](/language/functions/uuid), name-based UUIDs derive from namespace and an name,
|
|
producing the same UUID value every time if the namespace and name are
|
|
unchanged.
|
|
|
|
Name-based UUID namespaces are themselves UUIDs, but for readability this
|
|
function accepts some keywords as aliases for the namespaces that were
|
|
assigned by RFC 4122:
|
|
|
|
| Keyword | Namespace ID | Name format |
|
|
| -------- | -------------------------------------- | ---------------------------------------------------------------------------- |
|
|
| `"dns"` | `6ba7b810-9dad-11d1-80b4-00c04fd430c8` | A fully-qualified DNS domain name. |
|
|
| `"url"` | `6ba7b811-9dad-11d1-80b4-00c04fd430c8` | Any valid URL as defined in [RFC 3986](https://tools.ietf.org/html/rfc3986). |
|
|
| `"oid"` | `6ba7b812-9dad-11d1-80b4-00c04fd430c8` | An [ISO/IEC object identifier](https://oidref.com/) |
|
|
| `"x500"` | `6ba7b814-9dad-11d1-80b4-00c04fd430c8` | [X.500 Distinguished Name](https://tools.ietf.org/html/rfc1779) |
|
|
|
|
To use any other namespace not included in the above table, pass its assigned
|
|
namespace ID directly in the first argument in the usual UUID string format.
|
|
|
|
## Examples
|
|
|
|
Use the namespace keywords where possible, to make the intent more obvious to
|
|
a future reader:
|
|
|
|
```
|
|
> uuidv5("dns", "www.terraform.io")
|
|
a5008fae-b28c-5ba5-96cd-82b4c53552d6
|
|
|
|
> uuidv5("url", "https://www.terraform.io/")
|
|
9db6f67c-dd95-5ea0-aa5b-e70e5c5f7cf5
|
|
|
|
> uuidv5("oid", "1.3.6.1.4")
|
|
af9d40a5-7a36-5c07-b23a-851cd99fbfa5
|
|
|
|
> uuidv5("x500", "CN=Example,C=GB")
|
|
84e09961-4aa4-57f8-95b7-03edb1073253
|
|
```
|
|
|
|
The namespace keywords treated as equivalent to their corresponding namespace
|
|
UUIDs, and in some special cases it may be more appropriate to use the
|
|
UUID form:
|
|
|
|
```
|
|
> uuidv5("6ba7b810-9dad-11d1-80b4-00c04fd430c8", "www.terraform.io")
|
|
a5008fae-b28c-5ba5-96cd-82b4c53552d6
|
|
```
|
|
|
|
If you wish to use a namespace defined outside of RFC 4122, using the namespace
|
|
UUID is required because no corresponding keyword is available:
|
|
|
|
```
|
|
> uuidv5("743ac3c0-3bf7-4a5b-9e6c-59360447c757", "LIBS:diskfont.library")
|
|
ede1a974-df7e-5f17-84b9-76208818b2c8
|
|
```
|
|
|
|
When using raw UUID namespaces, consider including a comment alongside the
|
|
expression that indicates which namespace this represents in a
|
|
human-significant manner, such as by reference to the standard that
|
|
defined it.
|
|
|
|
## Related Functions
|
|
|
|
* [`uuid`](/language/functions/uuid), which generates pseudorandom UUIDs.
|