mime_message_composer
v1.0.2
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multipare encoded content composer
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Mime Message Composer
Mime / Multipart message composer is a package that helps to encode the request body in a multipart message format. This composer helps to create the multipart encoded body like multipart/alternative.
Info
This package works on a concept of content type. Every mutipart message hava a content type that describe what content it holds.
This package exposes two classes:
- BranchableCT (Branchable Content Type)
Those content type which have its boundary defined and have multiple child content types.
Example of BranchableCT are:multipart/alternative
,multipart/mixed
, and others - BodyCT (Body Content Type)
Those content type which do not have additional with in itself.
Example of BodyCT are:text/plain
,application/json
, and others
Docs
BranchableCT
- Constructor:
BranchableCT(ContentType:String, Boundary:String) - E.g: BranchableCT("multipart/alternative","alt_part1")
- Methods:
appendHeaders(headers: HeaderType[]):this - E.g appendHeaders([{name:"Content-Transfer-Encoding",value:"base64"}])
- HeaderType is a Object that has name and value property.
- Used to add headers to the content type.
addBranches(branches: ContentTypeI[]):this - E.g: addBranches([new BranchableCT(..), new BodyCT(..)])
- Add subBranch of this content type
- ContentTypeI interface is implemented by both Branchable and Body Interface.
compile():string - E.g: compile()
- Generate the compiled Mime message of this content type by combining with headers and branches.
BodyCT
- Constructor:
BodyCT(ContentType:String, additionalCT: HeaderType) - E.g BodyCT("application/json",{name:"name",value:"package.json"})
- Methods:
appendHeaders(headers: HeaderType[]):this - E.g appendHeaders([{name:"Content-Transfer-Encoding",value:"base64"}])
- HeaderType is a Object that has name and value property.
- Used to add headers to the content type.
getBody():string - eg getBody()
- Get Body data added to this content type class
setBody(data: string):this - E.g: setBody("any data depending on headers")
- Add body data to the content type.
compile():string - E.g: compile()
- Generate the compiled Mime message of this content type by combining with headers and branches.
Usage
const textPlain = new BodyCT({
contentType: "text/plain",
additionalCT: {
name: "charset",
value: "UTF-8"
}
}).appendHeaders([
{
name: "Content-Transfer-Encoding",
value: "7bit"
}
]).setBody("this is plain text body");
const textHtml = new BodyCT({
contentType: "text/html",
additionalCT: {
name: "charset",
value: "UTF-8"
}
}).appendHeaders([
{
name: "Content-Transfer-Encoding",
value: "7bit"
}
]).setBody("<b>this is plain text body</b>");
const alternative = new BranchableCT({
contentType: "multipart/alternative",
boundary: "foo-bar"
}).appendHeaders([
{
name: "Encoding",
value: "7bit"
}
]).addBranches([textPlain, textHtml]);
console.log(alternative.compile())
Output:
Content-Type: multipart/alternative; boundary="foo-bar"
Encoding: 7bit
--foo-bar
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
this is plain text body
--foo-bar
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 7bit
<b>this is plain text body</b>
--foo-bar--