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5. Consider Signpost for OAuth 1.0a

We initially turned to Scribe for our OAuth 1.0a needs, but it has its own Request class that uses java.net.HttpURLConnection to send and receive data. Therefore we could not use Stetho to inspect the data. Later we migrated to Signpost, which is a lightweight OAuth 1.0a library that allows using whatever networking layer you already have. All you must do is adapt instances of your request and response classes to the HttpRequest and HttpResponse interfaces defined by Signpost.

Our OkHttpOAuthRequest class adapts a com.squareup.okhttp.Request instance to the HttpRequest interface of Signpost. The implementation is quite straightforward. You can read OkHttpOAuthRequest.java in its entirety here, but here is an excerpt:

``

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As I mentioned earlier, I feel like the interface that I've sketched out for loading more and more search results from the server isn't very RAC-friendly. Its design doesn't step beyond that of a delegate, honestly.

To start, here's my current representation for a single search result, and for a sublist of the total search results:

struct SearchResultItem {
  let contentItem: ContentItem
  let topicTreePath: TopicTreePath

 var domain: KAContentDomain {

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//
//  Blehhhh.swift
//  Khan Academy
//
//  Created by Mike Parker on 11/2/15.
//  Copyright © 2015 Khan Academy. All rights reserved.
//

import UIKit
import KHACore

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DownloadReconciliation{
  initialState=InitialState{
    pendingResourceKeys=[
      Key{
        type=VIDEO_MP4, contentItemIdentifier=ContentItemIdentifier{
          itemKind=VIDEO,
          contentId=x6a16bad3
        }
      }
    ],

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09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ In org.khanacademy.android.debug:0.9:56.
09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ * LEAK CAN BE IGNORED.
09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ * org.khanacademy.android.ui.library.tablet.FullSubjectContentFragment has leaked:
09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ * GC ROOT android.view.inputmethod.InputMethodManager$ControlledInputConnectionWrapper.mParentInputMethodManager
09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ * references android.view.inputmethod.InputMethodManager.mNextServedView
09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ * references android.support.v7.widget.RecyclerView.mOnItemTouchListeners
09-17 11:53:31.457   32425-2176/org.khanacademy.android.debug D/LeakCanary﹕ * references java.util.ArrayList.array
09-17 11:53:31.457   32425-2176/org.khanacadem

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09-10 17:14:13.097  17759-17759/org.khanacademy.android.debug I/VideoViewActivity﹕ onResume
09-10 17:14:13.097  17759-17759/org.khanacademy.android.debug I/VideoSubtitlesFragment﹕ onResume
09-10 17:14:13.112  17759-18686/org.khanacademy.android.debug I/OMXClient﹕ Using client-side OMX mux.
09-10 17:14:13.113  17759-18686/org.khanacademy.android.debug W/linker﹕ libswscale.so has text relocations. This is wasting memory and prevents security hardening. Please fix.
09-10 17:14:13.113  17759-18686/org.khanacademy.android.debug D/SoftFFmpegVideo﹕ SoftFFmpegVideo component: OMX.ffmpeg.h264.decoder mMode: 0 appData: 0x9e08e480
09-10 17:14:13.116  17759-18686/org.khanacademy.android.debug W/OMXNodeInstance﹕ [1:ffmpeg.h264.decoder] component does not support metadata mode; using fallback
09-10 17:14:13.116  17759-18686/org.khanacademy.android.debug E/ACodec﹕ [OMX.ffmpeg.h264.decoder] storeMetaDataInBuffers failed w/ err -1010
09-10 17:14:13.118  17759-18686/org.khanacademy.android.debug V/SoftFFmpegVideo﹕ got OMX_Inde

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08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ In org.khanacademy.android.debug:0.7:38.
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ * org.khanacademy.android.ui.articles.ArticleViewActivity has leaked:
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ * GC ROOT org.khanacademy.android.Application.mComponentCallbacks
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ * references java.util.ArrayList.array
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ * references array java.lang.Object[].[3]
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ * references com.android.org.chromium.android_webview.AwContents$AwComponentCallbacks.this$0
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug D/LeakCanary﹕ * references com.android.org.chromium.android_webview.AwContents.mContainerView
08-31 14:32:27.428    2080-2232/org.khanacademy.android.debug

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<style name="Widget.Material.ActionButton" parent="Widget.ActionButton">
    <item name="minWidth">@dimen/action_button_min_width_material</item>
    <item name="minHeight">@dimen/action_button_min_height_material</item>
    <item name="gravity">center</item>
    <item name="scaleType">center</item>
    <item name="maxLines">2</item>
    <item name="paddingStart">12dp</item>
    <item name="paddingEnd">12dp</item>
</style>

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    public Toolbar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        // Need to use getContext() here so that we use the themed context
        final TintTypedArray a = TintTypedArray.obtainStyledAttributes(getContext(), attrs,
                R.styleable.Toolbar, defStyleAttr, 0);

        mTitleTextAppearance = a.getResourceId(R.styleable.Toolbar_titleTextAppearance, 0);
        mSubtitleTextAppearance = a.getResourceId(R.styleable.Toolbar_subtitleTextAppearance, 0);
        mGravity = a.getInteger(R.styleable.Toolbar_android_gravity, mGravity);

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package org.khanacademy.android.prefs;

import org.khanacademy.core.util.ObservableUtils;

import rx.Observable;
import rx.subjects.PublishSubject;

import android.content.SharedPreferences;

/**