Vendor dependencies with dep

vendor/github.com/minio/minio-go/post-policy.go

@@ -0,0 +1,209 @@
+package minio
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+	"time"
+)
+
+// expirationDateFormat date format for expiration key in json policy.
+const expirationDateFormat = "2006-01-02T15:04:05.999Z"
+
+// policyCondition explanation:
+// http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
+//
+// Example:
+//
+//   policyCondition {
+//       matchType: "$eq",
+//       key: "$Content-Type",
+//       value: "image/png",
+//   }
+//
+type policyCondition struct {
+	matchType string
+	condition string
+	value     string
+}
+
+// PostPolicy - Provides strict static type conversion and validation
+// for Amazon S3's POST policy JSON string.
+type PostPolicy struct {
+	// Expiration date and time of the POST policy.
+	expiration time.Time
+	// Collection of different policy conditions.
+	conditions []policyCondition
+	// ContentLengthRange minimum and maximum allowable size for the
+	// uploaded content.
+	contentLengthRange struct {
+		min int64
+		max int64
+	}
+
+	// Post form data.
+	formData map[string]string
+}
+
+// NewPostPolicy - Instantiate new post policy.
+func NewPostPolicy() *PostPolicy {
+	p := &PostPolicy{}
+	p.conditions = make([]policyCondition, 0)
+	p.formData = make(map[string]string)
+	return p
+}
+
+// SetExpires - Sets expiration time for the new policy.
+func (p *PostPolicy) SetExpires(t time.Time) error {
+	if t.IsZero() {
+		return ErrInvalidArgument("No expiry time set.")
+	}
+	p.expiration = t
+	return nil
+}
+
+// SetKey - Sets an object name for the policy based upload.
+func (p *PostPolicy) SetKey(key string) error {
+	if strings.TrimSpace(key) == "" || key == "" {
+		return ErrInvalidArgument("Object name is empty.")
+	}
+	policyCond := policyCondition{
+		matchType: "eq",
+		condition: "$key",
+		value:     key,
+	}
+	if err := p.addNewPolicy(policyCond); err != nil {
+		return err
+	}
+	p.formData["key"] = key
+	return nil
+}
+
+// SetKeyStartsWith - Sets an object name that an policy based upload
+// can start with.
+func (p *PostPolicy) SetKeyStartsWith(keyStartsWith string) error {
+	if strings.TrimSpace(keyStartsWith) == "" || keyStartsWith == "" {
+		return ErrInvalidArgument("Object prefix is empty.")
+	}
+	policyCond := policyCondition{
+		matchType: "starts-with",
+		condition: "$key",
+		value:     keyStartsWith,
+	}
+	if err := p.addNewPolicy(policyCond); err != nil {
+		return err
+	}
+	p.formData["key"] = keyStartsWith
+	return nil
+}
+
+// SetBucket - Sets bucket at which objects will be uploaded to.
+func (p *PostPolicy) SetBucket(bucketName string) error {
+	if strings.TrimSpace(bucketName) == "" || bucketName == "" {
+		return ErrInvalidArgument("Bucket name is empty.")
+	}
+	policyCond := policyCondition{
+		matchType: "eq",
+		condition: "$bucket",
+		value:     bucketName,
+	}
+	if err := p.addNewPolicy(policyCond); err != nil {
+		return err
+	}
+	p.formData["bucket"] = bucketName
+	return nil
+}
+
+// SetContentType - Sets content-type of the object for this policy
+// based upload.
+func (p *PostPolicy) SetContentType(contentType string) error {
+	if strings.TrimSpace(contentType) == "" || contentType == "" {
+		return ErrInvalidArgument("No content type specified.")
+	}
+	policyCond := policyCondition{
+		matchType: "eq",
+		condition: "$Content-Type",
+		value:     contentType,
+	}
+	if err := p.addNewPolicy(policyCond); err != nil {
+		return err
+	}
+	p.formData["Content-Type"] = contentType
+	return nil
+}
+
+// SetContentLengthRange - Set new min and max content length
+// condition for all incoming uploads.
+func (p *PostPolicy) SetContentLengthRange(min, max int64) error {
+	if min > max {
+		return ErrInvalidArgument("Minimum limit is larger than maximum limit.")
+	}
+	if min < 0 {
+		return ErrInvalidArgument("Minimum limit cannot be negative.")
+	}
+	if max < 0 {
+		return ErrInvalidArgument("Maximum limit cannot be negative.")
+	}
+	p.contentLengthRange.min = min
+	p.contentLengthRange.max = max
+	return nil
+}
+
+// SetSuccessStatusAction - Sets the status success code of the object for this policy
+// based upload.
+func (p *PostPolicy) SetSuccessStatusAction(status string) error {
+	if strings.TrimSpace(status) == "" || status == "" {
+		return ErrInvalidArgument("Status is empty")
+	}
+	policyCond := policyCondition{
+		matchType: "eq",
+		condition: "$success_action_status",
+		value:     status,
+	}
+	if err := p.addNewPolicy(policyCond); err != nil {
+		return err
+	}
+	p.formData["success_action_status"] = status
+	return nil
+}
+
+// addNewPolicy - internal helper to validate adding new policies.
+func (p *PostPolicy) addNewPolicy(policyCond policyCondition) error {
+	if policyCond.matchType == "" || policyCond.condition == "" || policyCond.value == "" {
+		return ErrInvalidArgument("Policy fields are empty.")
+	}
+	p.conditions = append(p.conditions, policyCond)
+	return nil
+}
+
+// Stringer interface for printing policy in json formatted string.
+func (p PostPolicy) String() string {
+	return string(p.marshalJSON())
+}
+
+// marshalJSON - Provides Marshalled JSON in bytes.
+func (p PostPolicy) marshalJSON() []byte {
+	expirationStr := `"expiration":"` + p.expiration.Format(expirationDateFormat) + `"`
+	var conditionsStr string
+	conditions := []string{}
+	for _, po := range p.conditions {
+		conditions = append(conditions, fmt.Sprintf("[\"%s\",\"%s\",\"%s\"]", po.matchType, po.condition, po.value))
+	}
+	if p.contentLengthRange.min != 0 || p.contentLengthRange.max != 0 {
+		conditions = append(conditions, fmt.Sprintf("[\"content-length-range\", %d, %d]",
+			p.contentLengthRange.min, p.contentLengthRange.max))
+	}
+	if len(conditions) > 0 {
+		conditionsStr = `"conditions":[` + strings.Join(conditions, ",") + "]"
+	}
+	retStr := "{"
+	retStr = retStr + expirationStr + ","
+	retStr = retStr + conditionsStr
+	retStr = retStr + "}"
+	return []byte(retStr)
+}
+
+// base64 - Produces base64 of PostPolicy's Marshalled json.
+func (p PostPolicy) base64() string {
+	return base64.StdEncoding.EncodeToString(p.marshalJSON())
+}