ec1f89217a
Full Mattermost server source with integrated Community Enterprise features. Includes vendor directory for offline/air-gapped builds. Structure: - enterprise-impl/: Enterprise feature implementations - enterprise-community/: Init files that register implementations - enterprise/: Bridge imports (community_imports.go) - vendor/: All dependencies for offline builds Build (online): go build ./cmd/mattermost Build (offline/air-gapped): go build -mod=vendor ./cmd/mattermost 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
85 lines
2.3 KiB
Markdown
85 lines
2.3 KiB
Markdown
# Date Constraints
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### Validate a date against constraints
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## Overview [](https://godoc.org/github.com/reflog/dateconstraints)
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This module is heavily based on https://github.com/Masterminds/semver so kudos to [Masterminds](https://github.com/Masterminds/semver).
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> _For now only RFC3339 dates are supported_
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## Basic Comparisons
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There are two elements to the comparisons. First, a comparison string is a list
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of space or comma separated AND comparisons. These are then separated by || (OR)
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comparisons. For example, `">= 2020-03-01T00:00:00Z < 2020-04-01T00:00:00Z || >= 2020-05-01T00:00:00Z"` is will validate if a date is between 01/03/2020 till 01/04/2020 OR it's after 01/05/2020.
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The basic comparisons are:
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- `=`: equal
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- `!=`: not equal
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- `>`: greater than
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- `<`: less than
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- `>=`: greater than or equal to
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- `<=`: less than or equal to
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## Usage
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```go
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import "github.com/reflog/dateconstraints"
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import "time"
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func main(){
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date, _ := time.Parse(time.RFC3339, "2020-03-10T00:00:00Z")
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c, _ := date_constraints.NewConstraint("> 2020-03-01T00:00:00Z <= 2020-04-01T00:00:00Z")
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if c.Check(&date) {
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// date is in range!
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}
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}
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```
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## Validation
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In addition to testing a date against a constraint, it can be validated
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against a constraint. When validation fails a slice of errors containing why a
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date didn't meet the constraint is returned. For example,
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```go
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c, err := date_constraints.NewConstraint("<= 2020-03-01T00:00:00Z, >= 2020-04-10T00:00:00Z")
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if err != nil {
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// Handle constraint not being parseable.
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}
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v, err := time.Parse(time.RFC3339, "2020-03-10T00:00:00Z")
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if err != nil {
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// Handle date not being parseable.
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}
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// Validate a date against a constraint.
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a, msgs := c.Validate(&v)
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// a is false
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for _, m := range msgs {
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fmt.Println(m)
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// Loops over the errors which would read
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// "2020-03-10T00:00:00Z is greater than 2020-03-01T00:00:00Z"
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// "2020-03-01T00:00:00Z is less than 2020-04-01T00:00:00Z"
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}
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```
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## Install
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```
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go get github.com/reflog/dateconstraints
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```
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## Contributing
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Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
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Please make sure to update tests as appropriate.
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## License
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[MIT](https://choosealicense.com/licenses/mit/)
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