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package it |
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import ( |
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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/code" |
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"github.com/muonsoft/validation/is" |
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"github.com/muonsoft/validation/message" |
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) |
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// URLConstraint is used to validate URL string. This constraint doesn’t check that the host of the |
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// given URL really exists, because the information of the DNS records is not reliable. |
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// |
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// This constraint doesn't check the length of the URL. Use LengthConstraint to check the length of the given value. |
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type URLConstraint struct { |
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isIgnored bool |
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supportsRelativeSchema bool |
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schemas []string |
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messageTemplate string |
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} |
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// IsURL creates a URLConstraint to validate an URL. By default, constraint checks |
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// only for the http:// and https:// schemas. Use the WithSchemas method to configure |
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// the list of expected schemas. Also, you can use WithRelativeSchema to enable support |
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// of the relative schema (without schema, e.g. "//example.com"). |
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func IsURL() URLConstraint { |
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return URLConstraint{ |
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schemas: []string{"http", "https"}, |
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messageTemplate: message.InvalidURL, |
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} |
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} |
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// SetUp will return an error if the list of schemas is empty. |
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func (c URLConstraint) SetUp() error { |
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if len(c.schemas) == 0 { |
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return errEmptySchemas |
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} |
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return nil |
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} |
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// Name is the constraint name. |
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func (c URLConstraint) Name() string { |
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return "URLConstraint" |
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} |
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// WithRelativeSchema enables support of relative URL schema, which means that URL value |
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// may be treated as relative (without schema, e.g. "//example.com"). |
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func (c URLConstraint) WithRelativeSchema() URLConstraint { |
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c.supportsRelativeSchema = true |
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return c |
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} |
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// WithSchemas is used to set up a list of accepted schemas. For example, if you also consider the ftp:// type URLs |
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// to be valid, redefine the schemas list, listing http, https, and also ftp. |
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// If the list is empty, then an error will be returned by the SetUp method. |
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func (c URLConstraint) WithSchemas(schemas ...string) URLConstraint { |
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c.schemas = schemas |
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return c |
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} |
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// Message sets the violation message template. You can use template parameters |
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// for injecting its values into the final message: |
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// |
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// {{ value }} - the current (invalid) value. |
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func (c URLConstraint) Message(message string) URLConstraint { |
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c.messageTemplate = message |
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return c |
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} |
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// When enables conditional validation of this constraint. If the expression evaluates to false, |
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// then the constraint will be ignored. |
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func (c URLConstraint) When(condition bool) URLConstraint { |
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c.isIgnored = !condition |
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return c |
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} |
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func (c URLConstraint) ValidateString(value *string, scope validation.Scope) error { |
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if c.isIgnored || value == nil || *value == "" { |
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return nil |
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} |
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schemas := c.schemas |
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if c.supportsRelativeSchema { |
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schemas = append(schemas, "") |
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} |
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if is.URL(*value, schemas...) { |
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return nil |
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} |
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return scope.BuildViolation(code.InvalidURL, c.messageTemplate). |
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AddParameter("{{ value }}", *value). |
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CreateViolation() |
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} |
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muonsoft /
validation
