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attachments.go
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attachments.go
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package flows
import (
"strings"
"github.com/nyaruka/goflow/excellent/types"
"github.com/nyaruka/goflow/utils"
)
// Attachment is a media attachment on a message, and it has the following properties which can be accessed:
//
// * `content_type` the MIME type of the attachment
// * `url` the URL of the attachment
//
// Examples:
//
// @run.input.attachments.0.content_type -> image/jpeg
// @run.input.attachments.0.url -> http://s3.amazon.com/bucket/test.jpg
// @(json(run.input.attachments.0)) -> {"content_type":"image/jpeg","url":"http://s3.amazon.com/bucket/test.jpg"}
//
// @context attachment
type Attachment string
// ContentType returns the MIME type of this attachment
func (a Attachment) ContentType() string {
offset := strings.Index(string(a), ":")
if offset >= 0 {
return string(a[:offset])
}
return ""
}
// URL returns the full URL of this attachment
func (a Attachment) URL() string {
offset := strings.Index(string(a), ":")
if offset >= 0 {
return string(a[offset+1:])
}
return string(a)
}
// Resolve resolves the given key when this attachment is referenced in an expression
func (a Attachment) Resolve(env utils.Environment, key string) types.XValue {
switch key {
case "content_type":
return types.NewXText(a.ContentType())
case "url":
return types.NewXText(a.URL())
}
return types.NewXResolveError(a, key)
}
// Describe returns a representation of this type for error messages
func (a Attachment) Describe() string { return "attachment" }
// Reduce is called when this object needs to be reduced to a primitive
func (a Attachment) Reduce(env utils.Environment) types.XPrimitive { return types.NewXText(a.URL()) }
// ToXJSON is called when this type is passed to @(json(...))
func (a Attachment) ToXJSON(env utils.Environment) types.XText {
return types.ResolveKeys(env, a, "content_type", "url").ToXJSON(env)
}
var _ types.XValue = (Attachment)("")
var _ types.XResolvable = (Attachment)("")
// AttachmentList is a list of attachments
type AttachmentList []Attachment
// Index is called when this object is indexed into in an expression
func (a AttachmentList) Index(index int) types.XValue {
return a[index]
}
// Length is called when the length of this object is requested in an expression
func (a AttachmentList) Length() int {
return len(a)
}
// Describe returns a representation of this type for error messages
func (a AttachmentList) Describe() string { return "attachments" }
// Reduce is called when this object needs to be reduced to a primitive
func (a AttachmentList) Reduce(env utils.Environment) types.XPrimitive {
array := types.NewXArray()
for _, attachment := range a {
array.Append(attachment)
}
return array
}
// ToXJSON is called when this type is passed to @(json(...))
func (a AttachmentList) ToXJSON(env utils.Environment) types.XText { return a.Reduce(env).ToXJSON(env) }
var _ types.XValue = (AttachmentList)(nil)
var _ types.XIndexable = (AttachmentList)(nil)