42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
package pogs
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import (
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"encoding/json"
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"fmt"
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"github.com/pkg/errors"
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)
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// ScopeUnmarshaler can marshal a Scope pog from JSON.
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type ScopeUnmarshaler struct {
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Scope Scope
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}
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// UnmarshalJSON takes in a JSON string, and attempts to marshal it into a Scope.
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// If successful, the Scope member of this ScopeUnmarshaler is set and nil is returned.
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// If unsuccessful, returns an error.
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func (su *ScopeUnmarshaler) UnmarshalJSON(b []byte) error {
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var scopeJSON map[string]interface{}
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if err := json.Unmarshal(b, &scopeJSON); err != nil {
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return errors.Wrapf(err, "cannot unmarshal %s into scopeJSON", string(b))
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}
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if group, ok := scopeJSON["group"]; ok {
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if val, ok := group.(string); ok {
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su.Scope = NewGroup(val)
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return nil
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}
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return fmt.Errorf("JSON should have been a Scope, but the 'group' key contained %v", group)
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}
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if systemName, ok := scopeJSON["system_name"]; ok {
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if val, ok := systemName.(string); ok {
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su.Scope = NewSystemName(val)
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return nil
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}
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return fmt.Errorf("JSON should have been a Scope, but the 'system_name' key contained %v", systemName)
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}
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return fmt.Errorf("JSON should have been an object with one root key, either 'system_name' or 'group'")
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}
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