I Love Javascript!

I've been going crazy. I need to change my company email signature. I do so, it works fine but next time I quit Mail.app it goes away. I messed around with plists and permissions. Nothing helped.

Then I found an article HERE.  It had the answer. I repeat it here for posterity.

The problem arises from some bug between Mail.app and iCloud Drive. The problem has been around at least since 2017. There does not appear to be a fix that will make Mail.app save signatures as long as it is involved with iCloud Drive. Fortunately, you can turn that on and off with no apparent harm.

Go to System Preferences->iCloud Drive, then click on iCloud Drives Options... button. In there, you will see a list that includes Mail. Uncheck Mail.

(Note: Mail appears in the list initially shown when you open the iCloud preference panel. This is not the correct one to uncheck. You need to click into iCloud Drive Options and uncheck Mail there.)

Back in Mail.app, you will find that signatures save correctly. Do your work. Quit Mail and reopen and you will find you new and changed signatures in place. Win!!

Once done, you can return to the iCloud Preference Panel->iCloud Drive->options and recheck Mail. Signatures will remain. Life will be good.

The context is that I had a request to add a feature to a Nodejs app that I wrote a couple of years ago. The purpose of the app is to grab a bunch of files off of an SFTP server and make files out of them. The purpose of this post is to provide a google friendly summary so nobody has to spend as much time on this as I did.

So, I fired up the app on my development machine. It looked ok at first but then it just stopped processing. Further investigation told me that the downloaded files got to disk and that the problem was that the ‘close’ event was never firing.

Inspiration strikes and I realize that the app was written for an older version of Nodejs. More experimentation revealed that the app runs correctly on versions up to 9.11.2 but at 10.0.0, it fails. For google, I restate: upgrade nodejs to version ten causes readable stream to never fire ‘close’ (or ‘end’ or any other) event.

After a full day and a half of research and experimentation, I learned that, starting in nodejs 10, readable streams default to ‘pause’ mode. Previously, they were in ‘flowing’ mode. In ‘pause’, the stream waits for the consumer to take data before it does anything else.

Well, sort of. It does provide the data, somehow. After all, my zip files were created and did work correctly.

In any case, I found a clue someplace that there had been a change to the default for streams. I found another clue that talked about the ‘paused’ behavior. Eventually I found a comment on stackoverflow (here) that mentioned read();

So, here’s the code:

sftpControls.sftpConnection
    .get(remoteDirectoryPath + name, false, null)
    .then(zipSourceStream => {
        const filePath = `${zipFileDirPath}/${name}`;
        zipSourceStream
            .pipe(qtools.fs.createWriteStream(filePath, { encoding: null }))
            .on('close', () => {
                zipSourceStream.destroy();
                next('', name);
            });
        zipSourceStream.read(); //tell the stream to be ‘flowing’
    })


That is the entire change. Add one read() and the stream becomes ‘flowing’ and emits a close event when it’s done.



A small warning. I tried to chain the .read() along with the pipe() and on() methods. That failed. The read() method does not return the source object. You will get an error, “no read().pipe()”. Reverse it and get “no pipe().read()”. You have to run it like it’s shown, directly off of the original stream object.

If anyone reading this actually understands why this is happening or how it works, I am sure future programmers will be grateful to read the comments. I know I will.


tl;dr: You can't. At least not in Javascript. (I beg you. Prove me wrong in the comments!)

Here's the problem I face.

I have a template system I use. It relies on a .ini file that has all the parts of (in this case) an email message. Subject, text body, html body, etc. It replaces tags in the elements with properties of a supplied object of the same name. The template also includes a property called 'transformations'.

Transformations contains a set of properties whose values are functions. When processing the replacement, my system runs the transformations against the other replacement properties and adds the result for replacement in the template. It's useful for making sure that names are capitalized or adding dates or changes to html styling based on the data.

The new challenge is that I need to have a transformation that gets a result from the database. The problem is that the database access is asynchronous. The system is set up to run simple string processing synchronously. There is no callback option.

I spent an entire day screwing around with generators/yield, async/await and reading what felt like the entire internet looking for an idea of how to deal with this. I consider putting the database function into code, per se, to be a crime. (I do not mind calling a specific system function but it has to be called from the primary locus of control, ie, the template. I don't want someone to look up later and find that the result is just not there anymore with no clue where it should have come from.)

I ended up adding a property to the template called 'asyncronousTransformations' and having the program that uses the template process them. This required back filling asynchrony several levels up the code. As you might imagine, sending email is asynchronous but the (hitherto) simple string processing was not. Now it is.

My iPhone has been a huge pain in the butt since iPhone X made it so that it thought my nipple under my shirt pocket is a finger that required it to do whatever my nipple wanted to do.

No more!! This article explains, settings->general->accessibility->tap to wake!! Disable it and my nipple is no longer empowered to hang up my phone calls.

And, it's harmless because settings->display & brightness->raise to wake makes it so that it almost always automatically wakes up when I want it to.

Salvation.

read more: How to turn off the Tap to Wake feature on your iPhone X

This is almost trivial unless you forget about it and try to research the solution. It's stupidly obscure, probably because it's so trivial.

I am using request to post into some application. I didn't have a convenient boilerplate to reference and the damn internet did not provide a decent example. Here is a working and completely adequate post block:

    request.post(
        {
            url:url,
            headers: {
                authorization: `${userId} ${authToken}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ propertyName:'propertyValue' })
        },
        (err, response, body) => {
            console.dir({ 'err': err });
            console.dir({ 'response': response });
            console.dir({ 'body': body });
            //callback(err, body);

        }
    );

This works but it didn't at first. On the receiving end (also nodejs, using express), the call was just fine, came back 200, showed its presence on the far end but, absolutely no post body content. The problem? I had forgotten to include the Content-Type header.

macOS sftp "no matching cipher found"

Add this to ~/.ssh/config

Host * SendEnv LANG LC_* Ciphers +aes256-cbc

Works like a charm.

Thanks to Jason.

read more: SSH issues with Mac OS X High Sierra

My interest in public key encryption continues. I wanted to be able to actually use a tool to play  so I wrote one.

It does these things:

1) Generate a key pair.
2) Extract a public key from a private key.
3) Manually enter public or private key.
4) Create a crypto text string from plain text input.
5) Extract plain text from a crypto string.


You can play with this at: http://genericwhite.com/rsaEncryptionDemo/

Here's the problem. A co-worker got a bizarre alert() dialog in a web app. It popped up and just said "1". It wasn't her code and she was completely stumped. That's how I got involved.

I looked around the code. Searched for errant /alert\(/, etc. Nothing worked.

Then I hit the developer console. I typed the best single thing I ever typed:

window.alert= msg=>{ console.log(msg); console.trace(); }

Yeh, I did that. You may enjoy my awesomeness.

Console.trace() gives a stack dump at the location that the alert dialog was called. That was very helpful.

You are welcome.

Access for Learning (a4l.org) is happy to announce a major new addition to the School Interoperability Framework (SIF) data model to support students with special needs. Comprising two major components, xIndividualizedEducationPlan and xIepTransfer, this release is the result of a two year effort led by TQ White II of the Central Minnesota Educational Research and Development Corporation (cmerdc.org) with the help of national experts in special education and data modeling. The effort is motivated by the recognized need to make a student’s individualized education plan (IEP) content available when a student transfers into a new school.

The new data models are intended to support three main use cases. 1) Immediate support for an administrator the very first time a student shows up in a new school. 2) Information to support the special education team as they adapt plans already in place to the resources and strategies of the receiving school. 3) Sufficient information for schools and districts to support reporting and resource management needs. The goal is to ensure that a school has the information needed to provide students having special needs with critical, ongoing services.

This new model is based on a thorough survey of the standard form sets published by nearly every state, as well as the federal government. They were categorized into representative groups for an exhaustive inventory of data and evaluation of documentation strategies. With the input of a workgroup averaging about ten people a structured hierarchy of elements was developed and refined. Once done, the work was passed to Jill Parkes, education data analyst, at CEDS (Common Educational Data Standards) a federal organization that develops a dictionary of education related data definitions.

The CEDS process did two things. First, they evaluated each element in the new, tentative IEP data model and, where appropriate, attached a formal definition to it, either new or in reference to an existing definition. Then it was put into a formal CEDS community review. CEDS stakeholders, especially those with an interest in special education, reviewed the new definitions and approved them. This discussion improved confidence in the data design and made it more complete.

After this information was added to the XML – and with substantially more confidence, the data model was formally moved into the Access for Learning community review process. Though some people looked at the XML and offered comments, the main process involved TQ making presentations to various groups explaining the process and product in detail. Many valuable comments were made that resulted in changes but two were especially valuable.

First was Megan Gangl, a co-worker of TQ’s at cmERDC. Megan has spent her entire career as special education teacher, case manager and leader of case managers. Her decades of experience brought many new details to the model, suggested reorganization of some parts and validated others. She identified missing details, helped to rename elements and refine both their data definitions and the explanations of their meanings. After the initial presentation, she spent several days collaborating on the model in detail. Once done, confidence in the usefulness, correctness and completeness of the model was again tremendously improved.

The day before community review started in October, a new person, Danielle Norton, joined the North American Technical Board. Danielle’s team contributed to the community review with sessions including the detailed overview presentation and discussions with various subgroups of her team. A particularly important contribution was made by Rick Shafer, a long experienced data architect, who noted some problems with normalization in the data model.

The initial motivation for the IEP effort was to support the transfer of students between schools or districts. Throughout the process, the foremost intention was to provide complete information for the receiving educational agency. As a consequence, the data model included data elements that were duplicates of things that were defined elsewhere in SIF. That is, it was badly de-normalized. It made it so that the element would provide a complete picture for a receiving district but was ill-suited for use as a local SIF entity object.

To solve this problem, the data model was split into two elements, xIndividualizedEducationPlan and xTransferIep. The former is completely normalized to serve as a formal entity. No data is represented that is defined elsewhere in SIF but is, instead, referenced with a refId. If a receiving program needs to know those details, it is expected to query the appropriate system for details.

The latter is conceived as a reporting object, i.e., it is intended to wrap information that is defined elsewhere for convenient reference. The xTransferIep includes structures that allow it to contain data referenced in the IEP that would otherwise require a query to a system to which the receiving organization may not have access. The xTransferIep is a complete representation of an IEP containing all details.

In this process, a new concept was added to SIF, the typed refId. Troubled by the fact that refIds inside the IEP provided no information about where the target information referenced by the refId could be found, TQ added several new data types to the data model. Each is a UUID (as is the generic refId) but each also included documentation elements that explain what the UUID refers to and where the data can be found. For example, one of the new types, iepCommonStudentContactRefIdPointerType, explains that it references a contact inside a student object, distinct from iepCommonContactRefIdPointerType, which points to an independent xContactType, e.g., service provider or doctor, somewhere else.

The last thing is that, with the help of Access for Learning’s John Lovell, the new data models were refined to fit the new xPress object strategy. It does not use XML attributes and refIds are only present for elements that need it. This allows easier use of the model in non-Java/.NET systems. xPress is a more recent addition to SIF v3 and has proven to be easier to work with and, consequently, more popular. It is expected that xPress will be the foundation of new infrastructure work to formally bring JSON into the data model.

As with any first effort, it is fully understood by TQ and the entire community that as this data model comes into actual use, shortcomings will be noted and ideas will be conceived. It is intended that the SpecEd/IEP workgroup will reconvene in the future to evaluate the results of implementation. That is to say that, as with the rest of SIF, the new IEP data models being released with SIF v3.5 are not the end of the effort to better support students with special needs. This release is the beginning of an ongoing effort to insure that SIF is able to help schools, districts and teachers have the information needed to support optimal educational outcomes and to allow students with special needs to have the brightest possible future.

For even more information, a video recording of the IEP Data Model Overview is available HERE. To contact TQ White II, leave word in the comments.