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I wrote a bash script similar to this one: Download an already uploaded Lambda function

Everything is fine with all lambda functions that have been deployed via SAM template files. However, when I retrieve the deployment package of a lambda function (application) that has been deployed via the web UI of AWS, all I get is the index.js file in the deployment package of that function.

Anyway, it is possible to generate a SAM yaml file that describes the architecture of the given lambda application by selecting it over the Lambda Management Console via Actions > Export Function > Download AWS SAM file. Consequently, there should be a possibility to do this via aws-cli or is that not possible at all?

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You can get function configuration with awscli https://docs.aws.amazon.com/cli/latest/reference/lambda/get-function-configuration.html and the response will contain a Code section with a link to the function package https://docs.aws.amazon.com/lambda/latest/dg/API_FunctionCodeLocation.html

Also, you can create a CloudFormation stack from the existing infrastructure with CloudFormer https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-using-cloudformer.html

Having a CloudFormation template you can get the resource description. https://docs.aws.amazon.com/cli/latest/reference/cloudformation/describe-stack-resources.html with the link to the function source code on S3.

See more on this in https://stackoverflow.com/a/55764927/6628583

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However, when I get the link to the function package, there is only the handler function since there was never a SAM template used when the function was deployed via UI. I need a way to get this infrastructure as code representation just like in the web-ui in order to retrieve a SAM template of the deployed function..
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This is a clue, not a complete answer, sorry. There should be, but there is not yet, an aws-cli to get this SAM content. The URI in the browser is obtuse with some obscure network calls, e.g.

https://us-west-2.console.aws.amazon.com/p/log/1/lambda/1/OP/&k0=feevc&m0=1&d0=%7B%22s_fid%22:%2233SNIPPEDC66-34SNIPPED7FE5B%22%7D&p0=exportSAM&cb=1595621538378&proxy-rid=7c6a6a31SNIPPEDf1a400b457cc

There seems to be no easy way to construct that URI to GET the exportSAM download.

The browser lambda.js is not much help, e.g.

 var A = Object(p.connect)((function(e) { return { blueprint: Object(v.b)(e).query.exportBp, integrationConfigs: h.c.getNodes(e), downloadMessages: h.c.getDownloadMessages(e), isOpen: !!Object(v.b)(e).query.exportModal, exporting: h.c.getExporting(e) } } ), (function(e) { return { downloadSam: function(t) { return e((n = t, { type: b.f.EXPORT_BLUEPRINT_TO_FLOURISH, blueprintName: n })); var n }, close: function() { return e(Object(m.c)({ query: { exportModal: void 0, exportBp: void 0 } }, { persistQuery: !0 })) } } } ), (function(e, t, n) { return S(S(S(S({}, n), e), t), {}, { downloadSam: function() { return t.downloadSam(e.blueprint) } }) }
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