muonsoft /
validation
| Total Lines | 49 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
| 1 | package validate |
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| 2 | |||
| 3 | import ( |
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| 4 | "errors" |
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| 5 | "net/url" |
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| 6 | ) |
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| 7 | |||
| 8 | var ( |
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| 9 | ErrUnexpectedSchema = errors.New("unexpected schema") |
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| 10 | ) |
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| 11 | |||
| 12 | // URL is used to validate that value is a valid URL string. By default (if no schemas are passed), |
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| 13 | // the function checks only for the http:// and https:// schemas. Use the schemas argument |
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| 14 | // to configure the list of expected schemas. If an empty string is passed as a schema, then |
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| 15 | // URL value may be treated as relative (without schema, e.g. "//example.com"). |
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| 16 | // |
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| 17 | // If value is not a valid URL the function will return one of the errors: |
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| 18 | // • parsing error from url.Parse method if value cannot be parsed as an URL; |
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| 19 | // • ErrUnexpectedSchema if schema is not matching one of the listed schemas; |
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| 20 | // • ErrInvalid if value is not matching the regular expression. |
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| 21 | func URL(value string, schemas ...string) error { |
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| 22 | if len(schemas) == 0 { |
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| 23 | schemas = []string{"http", "https"} |
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| 24 | } |
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| 25 | u, err := url.Parse(value) |
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| 26 | if err != nil { |
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| 27 | return err |
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| 28 | } |
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| 29 | |||
| 30 | err = validateSchema(u, schemas) |
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| 31 | if err != nil { |
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| 32 | return err |
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| 33 | } |
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| 34 | |||
| 35 | if !urlRegex.MatchString(value) { |
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| 36 | return ErrInvalid |
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| 37 | } |
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| 38 | |||
| 39 | return nil |
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| 40 | } |
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| 41 | |||
| 42 | func validateSchema(u *url.URL, schemas []string) error { |
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| 43 | for _, schema := range schemas { |
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| 44 | if schema == u.Scheme { |
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| 45 | return nil |
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| 46 | } |
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| 47 | } |
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| 48 | |||
| 49 | return ErrUnexpectedSchema |
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| 50 | } |
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| 51 |
